JP2021116483A - Antibacterial nonwoven fabric as well as sanitary materials, medical articles, clothing articles and food packaging material which are produced by using antibacterial nonwoven fabric - Google Patents

Abstract

To provide an antibacterial nonwoven fabric having high antibacterial performance by adding metal oxide particles having a predetermined particle diameter to thermoplastic resin fibers constituting the nonwoven fabric and uniformly and finely dispersing them, and to provide an antibacterial article using the antibacterial nonwoven fabric.SOLUTION: The antibacterial nonwoven fabric of the present invention is an antibacterial nonwoven fabric composed of thermoplastic resin fibers, and the nonwoven fabric comprises: 0.1 to 3.0 mass% of a surfactant; and 0.01 to 1 mass% of one or more kind of metal oxide particles having an average particle diameter of 500 nm or less, which are composed of oxides of metal elements selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten.SELECTED DRAWING: None

Description

The present invention relates to a non-woven fabric. More specifically, the present invention relates to an antibacterial nonwoven fabric having excellent antibacterial performance and an antibacterial article using the same.

Due to the growing interest in environmental hygiene in recent years, the outbreak of influenza, and the onset of new infectious diseases, various antibacterial materials and antibacterial articles using them are being actively developed. Among them, various articles using antibacterial non-woven fabric have been proposed because they are low in cost and easy to process.

In particular, it has been conventionally known that specific metal ions have an antibacterial effect, and inorganic antibacterial agents using these have volatilization and decomposition, etc., as compared with organic antibacterial agents having functional groups such as phenol and halogen. Not only is it highly safe, but it also has the characteristics of being excellent in sustainability of antibacterial action and heat resistance.

From the advantages of such an inorganic antibacterial agent, for example, as a non-woven fabric to which an inorganic antibacterial agent is applied, a non-woven fabric coated with a chemical solution obtained by mixing an inorganic antibacterial agent and a surfactant (see Patent Document 1) and hydrophilicity are used. A non-woven fabric produced by mixing a nonionic surfactant and a zinc oxide-based inorganic antibacterial agent with a polyolefin resin (see Patent Document 2) and fine particles of the inorganic antibacterial agent are exposed on the fiber surface for a certain amount or more. A non-woven fabric in which a specific number of non-woven fabrics (see Patent Document 3), a non-woven fabric A containing specific inorganic particles containing an antibacterial agent, and a non-woven fabric B having a smaller diameter and containing no inorganic particles are laminated. (See Patent Document 4) has been proposed.

Japanese Unexamined Patent Publication No. 2014-50790 Japanese Unexamined Patent Publication No. 2006-249615 Japanese Unexamined Patent Publication No. 2008-88609 Japanese Unexamined Patent Publication No. 2008-75227

Although it is possible to impart a certain degree of antibacterial performance by adding or applying an inorganic antibacterial agent to the non-woven fabric as in the proposals described in Patent Documents 1 to 4, the inorganic antibacterial agent is simply added to the non-woven fabric. In the current situation where the need for antibacterial articles having even higher antibacterial performance is increasing just by applying the coating, the effect cannot be said to be sufficient.

Therefore, an object of the present invention is to pay attention to the above-mentioned problems and to provide an antibacterial nonwoven fabric having unprecedented high antibacterial performance.

As a result of diligent studies to achieve the above object, the present inventors can further improve the antibacterial performance of the non-woven fabric when using metal oxide fine particles having a specific average particle size with a specific metal species. I got the finding.

The present invention has been completed based on these findings, and the following inventions are provided according to the present invention.

The antibacterial nonwoven fabric of the present invention is an antibacterial nonwoven fabric composed of thermoplastic resin fibers having an average single fiber diameter of 0.1 μm or more and 30 μm or less, and 0.1 of a surfactant is contained in the antibacterial nonwoven fabric. It is composed of oxides of metal elements selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten, and has an average particle size of 500 nm or less. Includes one or more kinds of physical particles as 0.01% by mass or more and 1% by mass or less.

According to a preferred embodiment of the antibacterial nonwoven fabric of the present invention, the metal oxide particles are zinc oxide particles.

Further, the sanitary material, medical product, clothing product or food packaging material of the present invention is made by using the above-mentioned antibacterial non-woven fabric.

Further, the method for producing an antibacterial non-woven fabric of the present invention is the above-mentioned method for producing an antibacterial non-woven fabric, which forms a non-woven fabric from a thermoplastic resin composition obtained by mixing a thermoplastic resin A and a thermoplastic resin B. The plastic resin A is composed of an oxide of a metal element selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten, and contains one or more metal oxide particles having an average particle diameter of 500 nm or less. It is contained so as to be 0.01% by mass or more and 1% by mass or less of the antibacterial non-woven fabric to be formed, and the thermoplastic resin A and / or B is 0.1% by mass or more of the antibacterial non-woven fabric forming the surfactant. It is contained so as to be 3.0% by mass or less.

According to a preferred embodiment of the method for producing an antibacterial nonwoven fabric of the present invention, the absolute value of the difference between the melt flow rate of the thermoplastic resin A and the melt flow rate of the thermoplastic resin B is 650 g / 10 minutes or more. be.

According to the present invention, by finely dispersing and containing metal oxide particles having a specific average particle size in a specific metal type in the fibers constituting the antibacterial non-woven fabric, the antibacterial performance is unprecedentedly high. An antibacterial non-woven fabric having the above can be obtained.

The antibacterial non-woven fabric of the present invention is a non-woven fabric composed of thermoplastic resin fibers and having an average single fiber diameter of 0.1 to 30 μm, and a surfactant is contained in the non-woven fabric in an amount of 0.1 to 3% by mass of copper or cobalt. Contains 0.01 to 1% by mass of metal oxide particles composed of oxides of metal elements selected from aluminum, nickel, zinc, palladium, molybdenum, and tungsten, and the particle size of the metal oxide particles is 500 nm or less. And, including. The components thereof will be described in detail below, but the present invention is not limited to the scope described below as long as the gist thereof is not exceeded.

First, the antibacterial nonwoven fabric of the present invention is composed of thermoplastic resin fibers. In the present invention, the thermoplastic resin fiber means that the constituent fiber is made of a thermoplastic resin composition.

In the present invention, the thermoplastic resin composition used for the thermoplastic resin fiber includes, for example, a polyolefin resin such as polyethylene and polypropylene, a polyester resin such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polylactic acid. Examples thereof include polycarbonate-based resins, polystyrene-based resins, polyphenylene sulfide-based resins, fluorine-based resins, polystyrene elastomers, polyolefin elastomers, polyester elastomers, polyamide elastomers, and elastomers such as polyurethane elastomers. Further, it is also possible to use a copolymer obtained by copolymerizing these homopolymers with different components, or a resin such as a blend of two or more different polymers.

Among these, JIS K7210-1: 2014 "Plastic-How to obtain melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics-Part 1: Standard test method" "8A method" Melt flow rate (MFR), which indicates the fluidity of the resin measured in accordance with the "mass measurement method", is commercially available in a wide lineup, and can be selected in various ways depending on the desired non-woven fabric form, and can be used at low cost. , Polypropylene resin is preferably used.

Additives such as heat stabilizers, weathering agents, crystal nucleating agents, lubricants and polymerization inhibitors are added to the thermoplastic resin used in the present invention as long as the effects of the present invention are not impaired. can do.

Next, the antibacterial nonwoven fabric of the present invention contains a surfactant in an antibacterial nonwoven fabric of 0.1% by mass or more and 3.0% by mass or less. By containing 0.1% by mass or more, preferably 0.7% by mass or more of the surfactant, an antibacterial nonwoven fabric having a good dispersed state of metal oxide particles and excellent antibacterial property and its durability can be obtained. .. On the other hand, by containing 5.0% by mass or less, preferably 3.0% by mass or less of the surfactant, an antibacterial nonwoven fabric having excellent strength can be obtained.

The content of the surfactant can be determined, for example, as follows. That is, after Soxhlet extraction of the non-woven fabric with an isopropanol / petroleum ether mixed solution, HPLC fractionation was repeated for the extract, and IR measurement, GC measurement, GC / MS measurement, MALDI-MS measurement, ¹ H-NMR for each fraction. Confirm the structure by measurement and ^{13 C-NMR measurement.} The mass of the fraction containing the additive is totaled, the ratio to the whole non-woven fabric is determined, and this is taken as the content of the surfactant.

As the surfactant used in the present invention, a cationic surfactant, an anionic surfactant, an amphoteric surfactant, a nonionic surfactant, or a mixture thereof is used. Various types of these surfactants can be selected from the dispersed state of the metal oxide particles in the thermoplastic resin.

Further, the antibacterial non-woven fabric of the present invention is composed of an oxide of a metal element selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten, and has an average particle size of 500 nm or less. Contains one or more particles of 0.01% by mass or more and 1% by mass or less. The details of this will be described below.

First, as the oxide of the metal element constituting the metal oxide particles used in the present invention, copper, cobalt, aluminum, nickel, zinc, palladium, from the viewpoint of excellent antibacterial performance when applied to an antibacterial non-woven fabric, Examples thereof include oxides of metal elements selected from molybdenum and tungsten. Of these, zinc oxide is particularly preferable from the viewpoint of excellent antibacterial performance. A metal oxide composed of oxides of a plurality of metal elements may be used.

That is, specific examples of the metal oxide used in the present invention include, for example, copper (I) oxide, copper (II) oxide, cobalt oxide (II), cobalt oxide (III), cobalt oxide (II, III), and the like. Aluminum (III) oxide, nickel (II) oxide, zinc (II) oxide, palladium (II) oxide, molybdenum oxide (VI), tungsten oxide (VI) and the like, and zinc (II) oxide is preferable.

The antibacterial nonwoven fabric of the present invention preferably contains one or more of these metal oxide particles.

Further, the metal oxide particles of the present invention have an average particle diameter of 500 nm or less. By setting the average particle size of the metal oxide particles to 500 nm or less, preferably 300 nm or less, more preferably 100 nm or less, the metal oxide particles can be uniformly finely dispersed in the thermoplastic resin fiber, and the antibacterial performance can be improved. Can be improved. In addition, problems in spinning such as clogging of the spinning nozzle and occurrence of yarn breakage can be suppressed. On the other hand, the average particle size of the metal oxide particles used in the present invention is not particularly limited, but it is generally preferable to use particles having a diameter of 1 nm or more from the viewpoint of handling nanomaterials.

As a method for measuring the particle size of the metal oxide particles, first, the antibacterial non-woven fabric is immersed in a non-polar hydrocarbon solvent such as xylene, decalin, or chlorobenzene to dissolve the thermoplastic resin, and the metal oxide particles are formed. Isolate. The isolated metal oxide particles may be uniformly dispersed in water, and a conventional laser diffraction / scattering particle size measuring device or the like may be used. It can be a diameter (nm).

Further, the antibacterial nonwoven fabric of the present invention contains one or more of the above-mentioned metal oxide particles in an amount of 0.01% by mass or more and 1% by mass or less. By setting the content of the metal oxide particles to 0.01% by mass or more, preferably 0.1% by mass or more with respect to the mass of the antibacterial nonwoven fabric, an antibacterial nonwoven fabric having excellent antibacterial performance can be obtained. can. On the other hand, by setting it to 1% by mass or less, preferably 0.5% by mass or less, not only the strength of the antibacterial non-woven fabric can be maintained, but also the spinning nozzle is clogged and resin lumps (shots) are generated on spinning. The problem can be suppressed.
In the present invention, the content of metal oxide particles can be determined by using analytical methods such as fluorescent X-ray analysis, atomic absorption spectrometry (FLAAS), and emission spectroscopic analysis (ICP-AES). For example, fluorescent X-ray analysis is a method of irradiating a non-woven fabric with X-rays and detecting the generated fluorescent X-rays. Since this fluorescent X-ray has energy peculiar to the element, qualitative analysis according to Mosley's law and quantitative analysis from fluorescent X-ray intensity are possible. In quantitative analysis, the relationship between the concentration of the element to be analyzed and the fluorescent X-ray (calibration curve) can be created in advance, and the concentration can be obtained from the fluorescent X-ray intensity obtained by measuring an unknown sample based on the result. ..

As the thermoplastic resin composition used for the antibacterial non-woven fabric of the present invention, JIS K7210-1: 2014 "Plastic-How to Obtain Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) of Thermoplastic Plastic-No. According to "8A method: mass measurement method" of "Part 1: Standard test method", the melt flow rate (MFR) measured under the conditions of a temperature of 230 ° C., a load of 2.16 kg, and a measurement time of 10 minutes is 50 g. It is preferably / 10 minutes or more and 2500 g / 10 minutes or less. By setting the melt flow rate of the thermoplastic resin composition to preferably 50 g / 10 minutes or more, more preferably 150 g / 10 minutes or more, the diameter of the fibers constituting the antibacterial nonwoven fabric can be easily reduced. On the other hand, the strength of the non-woven fabric can be improved by setting the melt flow rate of the thermoplastic resin composition to preferably 2500 g / 10 minutes or less, more preferably 2000 g / 10 minutes or less.

The thermoplastic resin fiber used in the antibacterial nonwoven fabric of the present invention preferably has an average single fiber diameter of 0.1 μm or more and 30.0 μm or less. The strength of the non-woven fabric can be improved by setting the average single fiber diameter to preferably 0.1 μm or more, more preferably 1.0 μm or more, and further preferably 5.0 μm or more. On the other hand, by setting the fiber surface area to 30.0 μm or less, more preferably 20.0 μm or less, still more preferably 15.0 μm or less, the fiber surface area of the antibacterial nonwoven fabric can be increased, and an antibacterial nonwoven fabric having excellent antibacterial performance can be obtained. Can be done.

The average single fiber diameter of the thermoplastic resin fibers used in the antibacterial non-woven fabric in the present invention is 3 points in the width direction (2 points at the side ends and 1 point in the center) of the non-woven fabric, and 5 points every 5 cm in the longitudinal direction. From a total of 15 points, 15 measurement samples of 3 mm x 3 mm were collected, and the magnification was adjusted to 3000 times with a scanning electron microscope (for example, "VHX-D500" manufactured by Keyence Co., Ltd.). A total of 15 fibers were taken, one for each fiber surface photograph. It refers to the value obtained by measuring the single fiber diameter of the fiber whose fiber diameter (single fiber diameter) can be clearly confirmed in the photograph and rounding off the second decimal place of the average value.

Further, the polyolefin-based resin fiber may be a composite fiber, and may take the form of a composite fiber such as a core sheath type, an eccentric core sheath type, a side-by-side type, a split type, a sea island type, or an alloy type.

The antibacterial nonwoven fabric of the present invention preferably has a basis weight of 3 g / m ² or more and 1000 g / m ² or less. By setting the basis weight of the antibacterial non-woven fabric to 3 g / m ² or more, more preferably 5 g / m ² or more, and further preferably 10 g / m ² or more, the antibacterial performance of the antibacterial non-woven fabric can be improved. On the other hand, ^{by setting the content to 1000 g / m 2} or less, more preferably 800 g / m ² or less, still more preferably 600 g / m ² or less, the thickness of the antibacterial nonwoven fabric can be reduced and the processability can be improved. The texture of the antibacterial non-woven fabric in the present invention is obtained by collecting a sample of vertical × horizontal = 15 cm × 15 cm from the antibacterial non-woven fabric, measuring the mass of the sample, and converting the ^{obtained value into a value per 1 m 2.} Then, the first decimal place is rounded off to calculate ^{the texture (g / m 2) of the non-woven fabric.}

The sanitary material of the present invention is preferably made of the antibacterial non-woven fabric of the present invention because the above-mentioned high antibacterial performance effect can be utilized. Specifically, for example, it can be used as a member for sanitary materials that require antibacterial properties, such as top sheets for disposable diapers, back sheets, side gathers and incontinence pads, sanitary napkins, and breast milk pads.

The medical product of the present invention is preferably made of the antibacterial non-woven fabric of the present invention because the above-mentioned high antibacterial performance effect can be utilized. Specifically, for example, it can be used as a member for medical supplies that require antibacterial properties, such as surgical masks, gauze, bandages, and medical drapes.

The clothing product of the present invention is preferably made of the antibacterial non-woven fabric of the present invention because the above-mentioned high antibacterial performance effect can be utilized. Specifically, for example, it can be used as a member for clothing products that require antibacterial properties, such as medical gowns, patient clothes, and aprons.

Since the food packaging material of the present invention can utilize the above-mentioned high antibacterial performance effect, it is preferably made of the antibacterial non-woven fabric of the present invention. Specifically, for example, it can be used as a member for food packaging materials that require antibacterial properties such as paper packs and paper cans.

That is, the antibacterial nonwoven fabric of the present invention can be suitably used for articles that require these antibacterial properties.

Subsequently, the method for producing the antibacterial nonwoven fabric of the present invention will be described.

In the production of the antibacterial non-woven fabric of the present invention, it is also possible to mix a surfactant and metal oxide particles in a thermoplastic resin at a time to form a thermoplastic resin composition, and use this to form a non-woven fabric. However, it is preferable to mix the thermoplastic resin A and the thermoplastic resin B, which will be described later, to prepare a thermoplastic resin composition to be used for forming a non-woven fabric. By doing so, the metal oxide particles can be uniformly finely dispersed in the thermoplastic resin fibers constituting the non-woven fabric, and the antibacterial performance can be further improved.

This thermoplastic resin A is composed of oxides of metal elements selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten, and has one or more metal oxide particles having an average particle diameter of 500 nm or less. Is preferably contained in an amount of 0.01% by mass or more and 1% by mass or less of the antibacterial non-woven fabric to be formed. By doing so, it is possible to obtain an antibacterial non-woven fabric having the above-mentioned effect, that is, excellent antibacterial performance, and it is possible to uniformly finely disperse the metal oxide particles in the thermoplastic resin fiber. The antibacterial performance can be further improved. In addition, problems in spinning such as clogging of the spinning nozzle and occurrence of yarn breakage can be suppressed.

Further, the thermoplastic resin A and / or B preferably contains a surfactant so as to be 0.1% by mass or more and 3.0% by mass or less of the antibacterial nonwoven fabric to be formed. By doing so, an antibacterial non-woven fabric having excellent antibacterial performance can be obtained.

Further, the absolute value of the difference between the thermoplastic resin A has a melt flow rate (MFR _A) and the thermoplastic resin B has a melt flow rate _{(MFR B) (| MFR A} -MFR B |) is 650 g / 10 It is preferably minutes or more. By doing so, it is possible to improve the dispersed state of the metal oxide particles in the thermoplastic resin, and to obtain an antibacterial nonwoven fabric having excellent antibacterial performance and durability thereof.

As a method for preparing a polyolefin resin composition containing metal oxide particles by the above method using the thermoplastic resin A and the thermoplastic resin B, the thermoplastic resin is extruded while being extruded using a twin-screw extruder or the like. The metal oxide particles may be mixed to prepare the thermoplastic resin A, and then the thermoplastic resin B may be mixed with the thermoplastic resin A, or the chip blend may be prepared using a master batch and then extruded. When using a master batch, for example, a master batch of a thermoplastic resin A in which metal oxide particles are kneaded into a thermoplastic resin such as polypropylene is prepared, and a thermoplastic resin B such as polypropylene is chip-blended into the master batch, and the inside of the extruder is used. By preparing a thermoplastic resin composition containing the metal oxide particles by kneading with the above, the metal oxide particles can be uniformly finely dispersed in the thermoplastic resin fibers.

Subsequently, a non-woven fabric is formed from the obtained thermoplastic resin composition. As a method for producing the non-woven fabric, a conventionally known technique may be used, for example, a web forming method such as a dry method, a wet method, a spunbond method, a melt blow method, or an airlaid method, and a chemical bond method, a thermal bond method, or a needle punch method. , A fiber bonding method such as a spunlace method can be used in combination. Among these, the spunbond method is a continuous process of spinning (forming threads) and fabric making (forming non-woven fabrics), which is excellent in productivity and cost, and is excellent in strength because it is composed of continuous fibers. And the melt blow method can be preferably used.

Next, the present invention will be specifically described based on Examples. However, the present invention is not limited to these examples.

(1) Non-woven fabric basis weight:
The mass of the melt-blown non-woven fabric of vertical × horizontal = 15 cm × 15 cm was measured for one sample. The obtained ^{value was converted into a value per 1 m 2} , and the first decimal place was rounded off to calculate ^{the basis weight (g / m 2) of the non-woven fabric.}

(2) Average single fiber diameter of non-woven fabric:
Regarding the average single fiber diameter, 15 measurement samples of 3 mm x 3 mm were collected from a total of 15 points, 3 points in the width direction of the non-woven fabric (2 points at the side edges and 1 point at the center) and 5 points every 5 cm in the longitudinal direction. Then, the magnification was adjusted to 3000 times with a scanning electron microscope (VHX-D500 manufactured by KEYENCE CORPORATION), and one fiber surface photograph was taken from each of the collected measurement samples, for a total of 15 photographs. The single fiber diameter was measured for the fiber whose fiber diameter (single fiber diameter) can be clearly confirmed in the photograph, and the second decimal place of the average value was rounded off to obtain the average single fiber diameter.

(3) Dispersion state of metal oxide particles of non-woven fabric:
Observe all 15 photographs taken by the same method as the method for measuring the average single fiber diameter, and the one in which no metal oxide particles are confirmed and the dispersed state is good is ○, and the one with one metal oxide particle. 1 to 5 particles are confirmed (aggregated part), those with slightly poor aggregation are marked with Δ, and 6 or more metal oxide particles are confirmed in one photograph (aggregated part), and those with poor aggregation are marked with ×. evaluated.

(4) Antibacterial performance of non-woven fabric:
The antibacterial performance of the non-woven fabric is based on the "8.1 Bacterial solution absorption method" of "Antibacterial test method and antibacterial effect of textile products" of JIS L1902: 2015, and the antibacterial activity value is used using the following three types of test bacteria. Asked.
(Test bacterial species)
Staphylococcus aureus: Staphylococcus aureus
-Methicillin-resistant Staphylococcus aureus: methicillin-resistant Staphylococcus aureus
・ Escherichia coli: Escherichia coli
The antibacterial activity value was calculated from the following formula and rounded off to the second decimal place to obtain the antibacterial activity value = LogA-LogB.
here,
A: Number of bacteria recovered after culturing the standard sample (cotton standard white cloth) for 18 hours B: Number of bacteria recovered after culturing the test sample for 18 hours The antibacterial activity value is less than 2.0 ×, 2.0 or more Less than 6.0 was evaluated as Δ, and 6.0 or more was evaluated as ◯.

[Example 1]
Anionic interface between a thermoplastic resin A containing 20% by mass of zinc oxide particles having a particle diameter of 20 nm and a melt flow rate of 230 g / 10 minutes as a thermoplastic resin raw material, and a polypropylene resin as a thermoplastic resin raw material. Thermoplastic with a melt flow rate of 1100 g / 10 minutes containing 1% by mass of the activator "Megafuck" (registered trademark) F-444 (manufactured by DIC Co., Ltd., indicated as "F-444" in Tables 1 and 2). Resin B was used.

The thermoplastic resin A and the thermoplastic resin B were mixed at a ratio of thermoplastic resin A: thermoplastic resin B = 1: 99 to perform chip blending. Next, the chip-blended thermoplastic resins A and B were put into the raw material hopper of the extruder, and the thermoplastic resin composition was generated and supplied to the gear pump while being melted and kneaded by the extruder. The thermoplastic resin composition weighed by the gear pump is discharged by the melt blow method using a base in which discharge holes with a diameter of 0.3 mm are arranged in a straight line, the discharge rate is 320 g / min, the nozzle temperature is 280 ° C, and the air pressure is high. By injecting under the condition of 0.19 MPa and adjusting the collection conveyor speed, a non-woven fabric having a ^{grain size of 20 g / m 2 was obtained.}

Table 1 shows the composition of the thermoplastic resin composition and the like, and Table 3 shows the measurement results and evaluation results of the obtained nonwoven fabric.

[Example 2]
A non-woven fabric was obtained by the same method as in Example 1 except that the mixing ratio of the thermoplastic resin A and the thermoplastic resin B was set to thermoplastic resin A: thermoplastic resin B = 5: 95.

Table 1 shows the composition of the thermoplastic resin composition and the like, and Table 3 shows the measurement results and evaluation results of the obtained nonwoven fabric.

[Example 3]
A non-woven fabric was obtained by the same method as in Example 1 except that the type of polypropylene used for the thermoplastic resin B was changed and the melt flow rate of the thermoplastic resin B was set to 900 g / 10 minutes.

Table 1 shows the composition of the thermoplastic resin composition and the like, and Table 3 shows the measurement results and evaluation results of the obtained nonwoven fabric.

[Example 4]
As a thermoplastic resin raw material, a thermoplastic resin A containing 40% by mass of zinc oxide particles having a particle diameter of 30 nm and a melt flow rate of 230 g / 10 minutes is used, and a mixture of the thermoplastic resin A and the thermoplastic resin B is used. A non-woven fabric was obtained by the same method as in Example 1 except that the ratio was thermoplastic resin A: thermoplastic resin B = 0.5: 99.5.

Table 1 shows the composition of the thermoplastic resin composition and the like, and Table 3 shows the measurement results and evaluation results of the obtained nonwoven fabric.

[Comparative Example 1]
A non-woven fabric was obtained by the same method as in Example 1 except that the thermoplastic resin A was not used and only the thermoplastic resin B was used.

Table 2 shows the composition of the thermoplastic resin composition and the like, and Table 3 shows the measurement results and evaluation results of the obtained nonwoven fabric.

[Comparative Example 2]
As the raw material for the thermoplastic resin, the same method as in Example 1 was used except that the thermoplastic resin A containing 20% by mass of zinc oxide particles having a particle diameter of 800 nm and having a melt flow rate of 230 g / 10 minutes was used as the raw material for the thermoplastic resin. A non-woven fabric was obtained.

Table 2 shows the composition of the thermoplastic resin composition and the like, and Table 3 shows the measurement results and evaluation results of the obtained nonwoven fabric.

As is clear from Table 3, the non-woven fabrics described in Examples 1 to 4 of the present invention have achieved high antibacterial activity values against any bacterial species and have excellent antibacterial performance. I understand.

On the other hand, the non-woven fabric described in Comparative Example 1 containing only the components containing no metal oxide particles has an antibacterial activity value against any bacterial species with respect to the non-woven fabrics described in Examples 1 to 4. Was a low result.

Further, the non-woven fabric described in Comparative Example 2 in which the particle size of the metal oxide particles contained in the thermoplastic resin A was 800 nm had thread breakage or shots during spinning with respect to the non-woven fabrics described in Examples 1 to 4. Not only did it occur frequently and the spinnability deteriorated, but also a lot of aggregation of metal oxide particles was confirmed, the dispersed state was poor, and the antibacterial activity value against Escherichia coli was inferior.

As described above, in the present invention, a non-woven fabric having excellent antibacterial performance can be obtained by adding metal oxide particles having a predetermined particle size to the thermoplastic resin fibers constituting the non-woven fabric and uniformly finely dispersing them. , Sanitary materials, medical supplies, clothing supplies, food packaging materials, and various other articles that require antibacterial performance can be suitably used.

Claims (8)

An antibacterial non-woven fabric composed of thermoplastic resin fibers having an average single fiber diameter of 0.1 μm or more and 30 μm or less, wherein a surfactant is contained in the antibacterial non-woven fabric in an amount of 0.1% by mass or more and 3.0% by mass or less. And 0.01 of one or more metal oxide particles having an average particle diameter of 500 nm or less, which is composed of oxides of metal elements selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten. An antibacterial non-woven fabric containing% by mass or more and 1% by mass or less. The antibacterial nonwoven fabric according to claim 1, wherein the metal oxide particles are zinc oxide particles. A sanitary material using the antibacterial non-woven fabric according to claim 1 or 2. A medical product using the antibacterial non-woven fabric according to claim 1 or 2. A clothing product using the antibacterial non-woven fabric according to claim 1 or 2. A food packaging material using the antibacterial non-woven fabric according to claim 1 or 2. The method for producing an antibacterial non-woven fabric according to claim 1 or 2, wherein a non-woven fabric is formed from a thermoplastic resin composition obtained by mixing a thermoplastic resin A and a thermoplastic resin B. 0 of the antibacterial non-woven fabric which is composed of oxides of metal elements selected from cobalt, aluminum, nickel, zinc, palladium, molybdenum and tungsten and forms one or more metal oxide particles having an average particle diameter of 500 nm or less. It is contained so as to be 0.01% by mass or more and 1% by mass or less, and the thermoplastic resins A and / or B are 0.1% by mass or more and 3.0% by mass or less of the antibacterial non-woven fabric forming the surfactant. A method for producing an antibacterial non-woven fabric, which is contained so as to be. The method for producing an antibacterial nonwoven fabric according to claim 7, wherein the absolute value of the difference between the melt flow rate of the thermoplastic resin A and the melt flow rate of the thermoplastic resin B is 650 g / 10 minutes or more.