JPH09176949A - Antimicrobial non-woven fabric obtained from split type conjugate fiber and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antimicrobial non-woven fabric excellent in antimicrobial performance, and to provide a method for producing the same. SOLUTION: This antimicrobial non-woven fabric is obtained from split type conjugate fibers (preferably spilt type conjugate filaments) in which a polymer component A and a polymer component B incompatible with the polymer component A are adhered to each other. At least a part of the spilt type conjugate fibers are split into the polymer A and the polymer B in the antimicrobial non-woven fabric. When the antimicrobial non-woven fabric contains hot-pressed parts, at least a part of the split type conjugate fibers in the non-hot-pressed parts are split into the polymer component A and the polymer component B. Therein, fibers A comprising the polymer component A and fiber B comprising the polymer component B are expressed. Inorganic antimicrobial agent particles exist on the split surfaces of the fibers A and the fibers B, and the particles partially expose to outside air in a state contacting with the outside air. Thereby, the antimicrobial performance of the non-woven fabric is remarkably improved in comparison with a case wherein inorganic antimicrobial agent particles exist only in a polymer component in a state not contacting with outside air.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an antibacterial nonwoven fabric obtained from splittable conjugate fibers and a method for producing the same, and more particularly to an antibacterial nonwoven fabric having remarkably excellent antibacterial performance and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, various kinds of antibacterial fiber products have been known. In particular, as an antibacterial non-woven fabric, one in which an antibacterial agent is contained in a synthetic fiber constituting the non-woven fabric is known. Inorganic particles are often used as the antibacterial agent. In order to produce a synthetic fiber containing an antibacterial agent composed of inorganic particles, a method of mixing an antibacterial agent in a fiber-forming synthetic resin and melt-spinning the synthetic resin is generally adopted ( Tokuhei 7
-65245).

However, the synthetic fiber containing the antibacterial agent obtained by such a method has a drawback that it has inferior antibacterial performance. The reason for this is that when a molten composition containing inorganic particles that are antibacterial agents contained in a molten synthetic resin is discharged from the spinning hole, the surface of the synthetic fiber formed by discharging is closely adhered to the side wall of the spinning hole. This is because there are no particles. That is, because the ejection is made in close contact with the side wall of the spinning hole,
The surface of synthetic fibers tends to be smooth, which results in
The inorganic particles, which tend to form irregularities on the surface of the synthetic fiber, are embedded inside the synthetic fiber. Therefore, in a conventional synthetic fiber containing an antibacterial agent, the antibacterial agent which is an inorganic particle exists only inside the synthetic fiber, and the antibacterial agent which is an inorganic particle is not exposed on the surface of the synthetic fiber. Therefore, the antibacterial non-woven fabric containing such synthetic fibers as constituent fibers could not exhibit sufficient antibacterial performance because the antibacterial agent was not in contact with the outside air.

[0004]

Therefore, the present invention uses the splittable conjugate fiber so that the antibacterial agent particles present inside the fiber are brought into contact with the outside air, and at least this is made up of the constituent fibers of the nonwoven fabric. By doing so, it is intended to provide an antibacterial nonwoven fabric having excellent antibacterial performance. The present invention also aims to provide a method for producing such an antibacterial nonwoven fabric.

[0005]

That is, according to the present invention, a splittable conjugate fiber obtained by laminating a polymer component A and a polymer component B which is incompatible with the polymer component A is used as a starting material. The non-woven fabric obtained as above, in which at least a part of the splittable conjugate fiber is a fiber composed of the polymer component A after the bonding of the polymer component A and the polymer component B is peeled off. A and a fiber B composed of a polymer component B are expressed,
The present invention relates to an antibacterial nonwoven fabric in which inorganic antibacterial agent particles are present on the release surface of the fiber A and / or the fiber B. Inorganic antibacterial agent particles are mixed in the polymer component A and / or the polymer component B, and the melted polymer component A and the polymer component B are discharged from the split type composite spinneret device, After obtaining the splittable composite continuous fiber obtained by laminating the polymer component A and the polymer component B, the splittable composite continuous fiber is deposited on the collecting surface to obtain a fibrous web, and then, At least a part of the splittable composite filaments present outside the thermocompression-bonded portion after heat is partially applied to the fibrous web to disperse the thermocompression-bonded portions in which the splittable composite filaments are bonded to each other. In the above, the antibacterial nonwoven fabric is characterized in that the polymer component A and the polymer component B are peeled off, and the fiber A made of the polymer component A and the fiber B made of the polymer component B are expressed. The present invention relates to a manufacturing method.

First, the antibacterial non-woven fabric according to the present invention is obtained by using splittable conjugate fibers. The splittable conjugate fiber is formed by laminating a polymer component A and a polymer component B. Specific examples of the bonding include the forms shown in FIGS. 1 to 4, but are not limited thereto. 1 to 4 are cross-sectional views of the splittable conjugate fiber, and FIG. 1 shows the outer peripheral portion of the polymer component B.
A plurality of polymer components A are embedded and bonded together. FIG. 2 shows that there are a plurality of polymer components A and B, each having a trapezoidal cross section, and each side of each trapezoid being bonded together, and having a circular cross section as a whole. It is a composite fiber. The white background in FIG. 2 indicates that the fiber is hollow. Therefore, the splittable conjugate fiber in FIG. 2 has a hollow cylindrical shape. In FIG. 3, a plurality of both polymer components A and B are present, the cross section of which is a wedge shape, and each side of each wedge is bonded, so that the cross section is circular as a whole. It is a type composite fiber. In FIG. 4, a plurality of polymer components A (polymer component A having a circular cross section) are attached to the outer periphery of the polymer component B.

The polymer component A and the polymer component B are incompatible with each other. This is for facilitating peeling at the bonded portion of the polymer component A and the polymer component B. When the polymer component A and the polymer component B are compatible,
This is because the polymer components A and B are mixed in the bonded portion of both, and it becomes difficult for both to peel off. The splittable conjugate fiber is generally composed of a polymer component A and a polymer component B, but other polymer components may be present as a third component.

The melting point of the polymer component A and the melting point of the polymer component B may be the same or different,
In general, they are preferably different. In particular, the melting point of the polymer component B is 30 to 180 than the melting point of the polymer component A.
C. is preferably lower, more preferably 40 to 160.degree. C. lower, and most preferably 50 to 140.degree. C. lower. The reason for this is that, when heat is applied to the splittable conjugate fiber to provide a thermocompression-bonded portion in which the splittable conjugate fibers are bonded to each other, only the polymer component B is softened or melted, and the polymer component A is softened and melted. This is because it is possible to maintain the fiber form without doing so. Therefore, even in the thermocompression bonding portion, the fibers made of the polymer component A remain, and a high-strength nonwoven fabric can be obtained. For example, when the melting point of the polymer component A and the melting point of the polymer component B are about the same, the entire thermocompression bonding portion is melted or softened to form a film, and the strength of the thermocompression bonding portion is reduced, resulting in a high-strength nonwoven fabric. It is difficult to obtain If the melting point difference between the polymer component A and the polymer component B becomes large (for example, if the melting point difference becomes 180 ° C. or more), it becomes difficult to produce the splittable conjugate fiber by the melt spinning method.

The melting points of the polymer components A and B are measured by the following method. That is, using a differential calorimeter (DSC-2C type manufactured by Perkin Elmer Co., Ltd.), a temperature rising rate of 20 ° C. /
The melting point was defined as the temperature that gives the extreme value of the melting absorption curve obtained by raising the temperature from room temperature in minutes.

Specific combinations of polymer component B and polymer component A (component B / component A) include polyamide polymer / polyester polymer, polyolefin polymer / polyester polymer and polyolefin polymer. Coalescent / polyamide-based polymers can be used. As the polyester-based polymer, polyethylene terephthalate, polybutylene terephthalate, a copolymer polyester containing these as a main component, or the like can be used. As the polyamide-based polymer, nylon 6, nylon 46, nylon 66, nylon 610, or copolymerized nylon containing these as a main component can be used. As the polyolefin-based polymer, polypropylene, high-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer, or the like can be used. In the polymer component A and / or the polymer component B, if necessary, a lubricant, a pigment, a matting agent, a heat stabilizer, a light stabilizer, an ultraviolet absorber, an antistatic agent, a conductive agent, a heat storage Agents and the like may be added.

The quantitative ratio of the polymer components A and B is a matter that can be arbitrarily determined. In the present invention, it is preferable to increase the area of the bonding surface between the polymer components A and B as much as possible, rather than the quantitative ratio. Therefore, the combined form of FIG. 2 or FIG. 3 is preferable according to the drawings. Further, when the melting point of the polymer component B is made lower than the melting point of the polymer component A to some extent and the polymer component B is used as an adhesive (fusion agent), component A / component B = 20 to 80 / 80-2
It is preferably 0 (parts by weight). If the amount of the polymer component B is less than 20 parts by weight, the adhesive strength of the splittable conjugate fiber due to fusion will decrease, and it tends to be difficult to impart sufficient tensile strength to the resulting nonwoven fabric. On the other hand, when the amount of the polymer component B exceeds 80 parts by weight, fusion between the splittable conjugate fibers becomes severe, and the thermocompression bonding portion becomes a film-like or has holes, resulting in The tensile strength of the resulting non-woven fabric tends to decrease.

The splittable conjugate fibers used in the present invention may be long fibers or short fibers. Generally, long fibers are preferred. It is more rational to deposit a long fiber as it is to produce a nonwoven fabric than to produce a nonwoven fabric after cutting the long fiber into short fibers. The fineness of the splittable conjugate fiber is a matter that can be arbitrarily determined, but is preferably 2 to 12 denier. When the fineness of the splittable conjugate fiber is less than 2 denier, the fineness of the fibers A and / or fibers B produced by the splitting tends to be less than 0.05 denier, and when such fineness is obtained, the inorganic antibacterial agent is used. It becomes difficult to include the agent particles, and the inorganic antibacterial agent particles tend to fall off. On the contrary, when the fineness of the splittable conjugate fiber exceeds 12 denier, the fineness of the fiber A and / or the fiber B also becomes large, and it becomes difficult to obtain a nonwoven fabric having a low basis weight and a good texture, or the flexibility is lowered. There is a tendency to

The non-woven fabric according to the present invention is manufactured by using the above-mentioned splittable conjugate fiber. However, even if fibers other than the splittable conjugate fiber are mixed at a ratio of about 50% by weight or less. It doesn't matter. At least a part of the splittable conjugate fiber in the nonwoven fabric is peeled off. That is, on the bonding surface of the polymer component A and the polymer component B, both are separated. As a result, in the separated portion, fibers A made of the polymer component A and fibers B made of the polymer component B are produced.

Inorganic antibacterial agent particles are present on the release surface of the fiber A and / or the fiber B. Specifically, there are cases where the inorganic antibacterial agent particles are present only on the release surface of the fiber A (the surface that was the bonding surface of the polymer component A), and the release surface of the fiber B (polymer In some cases, the inorganic antibacterial agent particles may be present only on the surface which was the bonding surface of the component B), and further, the inorganic antibacterial agent particles may be present on the peeled surfaces of both the fiber A and the fiber B. There are also cases. Here, the fiber A and / or the fiber B
The presence of the inorganic antibacterial agent particles on the peeled surface means that at least one surface of the inorganic antibacterial agent particles is exposed and is in contact with the outside air. In this way, since the inorganic antibacterial agent particles are present on the fiber surface in contact with the outside air, the antibacterial performance is higher than that when the inorganic antibacterial agent particles are present inside the fiber without contacting the outside air. Is significantly improved. It should be noted that the inorganic antibacterial agent particles are generally present not only on the peeled surface of the fiber A and / or the fiber B but also inside the fiber A and / or the fiber B.
Needless to say.

The particle size of the inorganic antibacterial agent particles used in the present invention is preferably about 0.01 to 3 μm. Particles having a particle size of less than 0.01 μm tend to be too fine to handle and lead to cost increase. If the particle size exceeds 3 μm, the exposed area or volume of the particles tends to increase when present on the peeling surface of the fiber A and / or the fiber B, and tends to fall off due to external force such as friction. Or the operability tends to decrease. Therefore, more preferably, the particle size of the inorganic antibacterial agent particles is 0.05 to 1 μm. The particle size referred to here means the weight average particle size.

As the active ingredient having the antibacterial activity of the inorganic antibacterial agent particles, any conventionally known one can be used. For example, a substance in which a chemical substance having antibacterial activity is adsorbed on a carrier having a predetermined particle size, or an inorganic substance having antibacterial activity is adjusted to have a predetermined particle size is used. In the present invention,
Zirconium phosphate silver, zeolite silver, Ca _0.95 Zn
_0.05 (OH) ₂ , Ca _0.95 Cu _0.05 (OH) ₂ , Cu _0.67
Al _0.33 O, Mg _0.93 Cu _0.07 O, Mg _0.90 Zn
_It is preferable to use at least one kind or two or more kinds selected from the group consisting of _0.10 O, Al ₂ Mg ₃ ZnO, and Al ₂ Mg ₅ ZnO. The reason for this is that these active ingredients maintain their particle morphology without a carrier. Further, it is preferable to use two or more kinds of active ingredients, because they have antibacterial properties against different bacteria.

The content of the inorganic antibacterial agent particles in the fiber A and / or the fiber B is preferably 0.05 to 10% by weight, and particularly preferably 0.5 to 5.0% by weight. . If the content of the inorganic antibacterial agent particles is less than 0.05% by weight, it tends to be difficult to exhibit sufficient antibacterial performance. Further, the content of the inorganic antibacterial agent particles is 10% by weight.
When it exceeds, the amount of the inorganic antibacterial particles present on the peeled surface of the fiber A and / or the fiber B tends to be too much, and the proportion of the inorganic antibacterial particles to be dropped tends to increase.

The antibacterial non-woven fabric according to the present invention contains at least fibers A and B produced by split splitting (peeling) of splittable conjugate fibers, and an inorganic antibacterial agent is provided on the release surface of the fibers A and / or B. The agent particles are present. In order to impart morphological stability to this non-woven fabric, it is preferable to provide a thermocompression bonding part in which the constituent fibers are bonded to each other. For example, heat may be applied to the fibrous web on which the splittable conjugate fibers are deposited to thermally bond the splittable conjugate fibers to each other before the splittable conjugate fibers are separated. At this time, it is preferable to employ, as the splittable conjugate fiber, one having a melting point of the polymer component B lower than that of the polymer component A. Then, only the polymer component B is softened or melted, and the splittable conjugate fibers are thermally bonded to each other by the polymer component B. It is preferable that the thermocompression bonding portions are partially provided and scattered in the nonwoven fabric. For example, it is preferable to provide a thermocompression bonding portion in the form of dots or a grid. Then, it is preferable that the splittable conjugate fiber is peeled off in an area outside the thermocompression bonding portion. When the dotted thermocompression bonding parts are provided, the area of each point compression bonding part is 0.1 to 3.0 mm.
^{About 2} is preferred. Further, the total area of the thermocompression bonding portion is preferably about 2 to 50% with respect to the surface area of the non-woven fabric, and particularly 4 to
It is preferably 20%. When a grid-like thermocompression bonding part is provided, the width of each line forming the grid is 0.1.
The distance between the lines is preferably about 1 to 10 mm.

The basis weight of the antibacterial nonwoven fabric according to the present invention is a matter which can be arbitrarily determined, but generally 10 to 250 g.
/ M ² or so. Of these, antibacterial non-woven fabrics with relatively low weight are used for bedding such as bed sheets and pillow covers, wipers,
It is suitable for use as an absorbent or surface material for sanitary materials such as sanitary napkins and disposable diapers. Further, the antibacterial non-woven fabric having a relatively high basis weight is preferably used for a filter material, a cotton pad for a sleeping bag or a bedding, a base cloth for a carpet or artificial leather, a heat insulating material for a building, and the like.

Next, the manufacturing method of the antibacterial nonwoven fabric according to the present invention will be mainly described. First, the polymer component A and the polymer component B are prepared. Among them, the inorganic antibacterial agent particles are mixed in the polymer component A and / or the polymer component B. Although any method may be used as a method for mixing the inorganic antibacterial agent particles with the polymer component A or the like, it is preferable to employ the masterbatch method. The masterbatch method is, for example, a polymer component A containing a high concentration of inorganic antibacterial agent particles.
And a polymer component A containing no inorganic antibacterial agent particles
Are mixed to obtain a polymer component A in which a predetermined amount of inorganic antibacterial agent particles are mixed. By adopting such a masterbatch method, the inorganic antibacterial agent particles can be contained relatively uniformly in the polymer component. As the polymer component A, the polymer component B, and the inorganic antibacterial agent particles, the above-mentioned various ones can be arbitrarily used.

The content of the inorganic antibacterial agent particles in the polymer component A and / or the polymer component B is 0.05-10.
It is preferable that the amount is about% by weight. The polymer component A and the polymer component B thus prepared are put into a composite melt spinning apparatus, and each melts. Then, the molten state is introduced into the composite spinneret and discharged. After discharging, the splittable conjugate fiber is obtained by cooling and drawing. Then, by depositing the splittable conjugate fiber, a fibrous web is obtained.

Specifically, it is preferable to obtain a fibrous web by the following spunbond method. That is, spun yarn discharged from the composite spinneret (unstretched split-type composite long fibers)
Cooled and introduced into air soccer. The air sucker is usually called an air jet, and the fibers are conveyed and drawn by the action of sucking and sending air. The spun yarn introduced into the air sucker is conveyed to the outlet of the air sucker while being drawn, and the spun yarn group becomes a split type composite long fiber group when the drawing is completed. Then, the split-type composite continuous fiber group is opened by an opening device provided at the outlet of the air soccer. As the fiber opening method, a conventionally known method is employed, for example, a corona discharge method, a triboelectric charging method, or the like. Then, the split-type composite long fiber group thus opened is accumulated on a moving collecting conveyor made of wire mesh or the like to form a fibrous web.

Thereafter, the splittable composite long fibers in the fibrous web are bonded or entangled with each other to improve the morphological stability of the fibrous web. For example, a binder (adhesive) may be partially applied to the fibrous web to bond the splittable composite long fibers to each other. In addition, the splittable composite filaments may be partially softened or melted by using an embossing device or an ultrasonic welding device so that the splittable composite filaments are self-bonded to each other.
Further, the fiber web may be subjected to water needling or needle punching so that the splittable composite long fibers are entangled with each other. When self-bonding the splittable composite filaments to each other, the splittable conjugate filaments are used as the high melting point polymer component A.
It is preferable that the polymer component B is bonded to the splittable composite long fibers by softening or melting only the polymer component B. Further, when water needling or needle punching is applied to the fibrous web, entanglement between the splittable composite long fibers and separation of the polymer component A and the polymer component B in the splittable composite long fibers occur. It can happen at the same time.

As a concrete method for stabilizing the shape of the fibrous web, heat is partially applied to the fibrous web obtained by the spunbond method to form a thermocompression bonding portion in which the splittable composite long fibers are bonded to each other. It is preferably provided. In particular, it is preferable that only the polymer component B of the splittable composite long fibers is softened or melted so that the thermocompression-bonded portions in which the splittable composite long fibers are bonded to each other are scattered. As a method of partially heating the fibrous web,
An embossing device composed of a concavo-convex roll and a smooth roll, or an embossing device composed of a pair of concavo-convex rolls may be used to heat the concavo-convex roll and press the convex portion against the fibrous web. At this time, it is generally preferable that the concavo-convex roll is heated to a temperature equal to or lower than the melting point of the splittable composite long fibers (or lower than the melting point when the polymer component B has a low melting point). If the concavo-convex roll is heated to a temperature exceeding the melting point of the splittable composite filaments, the splittable composite filaments are melted violently in the thermocompression bonding portion, and holes may be opened in the thermocompression bonding portion. In addition, the tip surface shape of the convex part of the concave-convex roll is round, oval,
Any shape such as a rhombus, a triangle, a T shape, a well shape or a lattice shape can be adopted.

In the fibrous web in which the splittable composite filaments are partially bonded to each other, the splittable composite filaments having unbonded portions are present in the non-bonded areas.
The fiber A made of the polymer component A and the fiber B made of the polymer component B are obtained by peeling off the bonding of the polymer component A and the polymer component B of the splittable conjugate long fiber at this location.
And can be expressed. The formation of the fibers A and the fibers B is sufficient if it occurs in at least a part of the splittable conjugate long fibers, and does not need to occur in all of the splittable conjugate long fibers in the non-bonding area. That is, the peeling rate (divided splitting rate) does not have to be 100%,
Above, preferably about 70% or more. Here, the peeling rate is measured by the following method. That is, several parts of the non-woven fabric after the splittable composite long fibers were peeled off were observed with a scanning electron microscope to obtain the polymer component A.
Observe the ratio of the area where the polymer component B is peeled off,
It is measured by determining the average value.
As a result, the inorganic antibacterial agent particles existing inside the splittable composite long fibers are exposed to the outside at the peeling surface. When the fiber web is subjected to water needling or needle punching, the entanglement of the splittable composite filaments and the separation of the splittable composite filaments often occur at the same time. No stripping treatment is required.

As a means for peeling the polymer component A and the polymer component B in the splittable composite continuous fiber, water needling or needle punching adopted in the confounding means can be used, but in general, Is preferably subjected to a rubbing process to separate the polymer component A and the polymer component B from each other.
As a method of kneading, when introducing the fibrous web into the roll, the buckling compression method of bending the fibrous web at a higher introduction speed than the derivation speed, a high-pressure liquid flow treatment method of applying a high-pressure liquid flow to the fibrous web Etc. can be adopted. When the buckling compression method is adopted, it is preferable to use a micro-creper machine manufactured by Mike Rex, a cam fit machine manufactured by Uenoyama Kiko, or the like. Further, when the high-pressure jet treatment method is adopted, it is preferable to use a high-pressure jet dyeing machine which is generally used in the dyeing process.

[0027]

EXAMPLES Hereinafter, the present invention will be specifically described based on Examples, but the antibacterial nonwoven fabric according to the present invention and the method for producing the antibacterial nonwoven fabric according to the present invention are not limited to these Examples. Absent. The measurement and evaluation of each characteristic in the examples were performed by the following methods.

[Melt index values of polymer components A and B]: Measured at a temperature of 190 ° C. according to the method described in ASTM-D-1238 (E). [Unit weight of antibacterial non-woven fabric]: 10 from the standard sample
cm × 10 cm horizontal, 10 points of sample pieces were prepared, equilibrated water content was weighed, the weight of each sample piece was weighed, the average value of the obtained values was converted per unit area, and the basis weight (g / m ² ) And

[Tensile strength of antibacterial non-woven fabric]: Constant speed elongation type tensile tester (Tensilon UTM manufactured by Toyo Baldwin Co., Ltd.
4-1-100) according to the strip method described in JIS L-1096, sample width 5 cm and sample length 2
Ten 0 cm sample pieces were prepared and measured at a gripping interval of 10 cm and a tensile speed of 10 cm / min. In this case, find the average value of the maximum individual tensile strengths and calculate the tensile strength (kg / 5c
m). The tensile strength of the sample piece having the direction of the sample length aligned with the machine direction was the longitudinal tensile strength, and the tensile strength of the sample piece having the direction of the sample width aligned with the machine direction was the transverse tensile strength. [Specific surface area of antibacterial non-woven fabric]: Measured based on BET nitrogen adsorption method using "BELSORP28" manufactured by Bell Japan. As the sample, small pieces each having a width of 2 cm and a length of 10 cm were prepared in advance, and several pieces were packed up to the target line of the sample tube for measurement, and the specific surface area (m ² / g) of the fibers constituting the antibacterial nonwoven fabric was measured.

[Antibacterial performance of antibacterial non-woven fabric]: The number of bacteria was counted according to the shake flask method defined by the Textile Product Processing Hygiene Council, and 1 against the average number of bacteria immediately after adjustment.
The sterilization rate was calculated by the ratio of the difference in reduction of the average number of cells after the time culture, and the evaluation shown below was performed. The test strains used were the following four types. a) Klebsiella pneumoniae
IFO 3317 (Kleshpra's bacterium) b) Mesicillin having an MIC value of μg / ml (MRSA) c) Staphylococcus IFO 127
32 (Staphylococcus aureus) d) Pseudomonas acruginos
a IFO 345 (Pseudomonas aeruginosa) A sterilization rate of 25% or less for any of the test strains is ×, a sterilization rate of any of the test strains exceeds 25%, and Δ is sterilization for any of the test strains. 25%
When the sterilization rate exceeded 75% and was 75% or less, it was evaluated as ◯.

Example 1 Polyethylene terephthalate having a melting point of 256 ° C. as a high-melting polymer component A and a relative viscosity of 1.38 at 20 ° C. when dissolved in an equal amount mixed solvent of tetrachloroethane and phenol. Prepared. On the other hand, as the low-melting polymer component B, high-density polyethylene having a melting point of 132 ° C. and a melt index value of 20 g / 10 minutes is used. Agent particles "Product name: Novalon AG30
0 "(silver zirconium phosphate) 0.1% by weight was prepared. In order to add 0.1% by weight of the inorganic antibacterial agent particles to the polymer component B, a masterbatch containing 10% by weight of the inorganic antibacterial agent particles in high-density polyethylene is used. It was carried out by adopting a so-called masterbatch method in which 99 parts by weight of high-density polyethylene and melt were mixed.

The above polymer component A and the polymer component B containing the inorganic antibacterial agent particles were melted and introduced into the composite spinneret. The composite spinneret was provided with 210 composite spinning holes, and each composite spinning hole employed had a shape capable of obtaining a split-type composite fiber having a cross section as shown in FIG. In the composite melt spinning, a composite spinning machine base in which the number of spindles of the composite spinneret is 4 was used. The single-hole discharge rate was 1.3 g / min, and the composite ratio [polymer component A / inorganic antibacterial agent particle-containing polymer component B (weight ratio)] was 1.
Composite spinning was performed so as to be 4/1. The temperature of the polymer line was 285 ° C. for the polymer component A, 230 ° C. for the polymer component B, and the spinning temperature was 285 ° C.
° C was applied.

Next, the spun yarn spun from the composite spinneret is cooled by a cooling device, and 150 cm below the spinneret.
In the air soccer group arranged at the position of
The fiber was collected at 000 m / min, and the splittable composite long fiber group was opened by a known fiber-opening device, and then deposited on a moving wire mesh collecting conveyor to obtain a fiber web. The basis weight of this fibrous web was about 50 g / m ² , and the fineness of the splittable composite continuous fiber group constituting the fibrous web was about 3 denier. Then, this fibrous web was introduced into an embossing device consisting of an engraving roll and a smooth roll heated to 122 ° C., and heat was partially applied to provide a thermocompression bonding part. The area of each thermocompression bonding part was 0.68 mm ² , the ratio of the total area of the thermocompression bonding parts to the surface area of the fibrous web was 7.6%, and the density of the thermocompression bonding parts was 16.0 pieces / cm ^2. It was

Next, the fibrous web provided with the thermocompression bonding portion is passed through a Microcreper II manufactured by Microlex Co., Ltd. to be kneaded to obtain a polymer component A and a polymer component B of splittable composite long fibers. Was peeled off to express the fiber A made of the polymer component A and the fiber B made of the polymer component B containing the inorganic antibacterial agent particles. The conditions for passing the fibrous web through the Microcreper II manufactured by Microlex are as follows. That is, the processing speed is 10 m / min, the nip pressure is 6 kg /
cm ^2, retarder on the pressure 3 kg / cm ^2, retarder pressure 5 kg / cm ^2, and the supply roll temperature 50 ° C.. As described above, the thermocompression-bonded portions are scattered, and at least the fibers A having a fineness of about 0.3 denier and the fibers B having a fineness of about 1.3 denier are developed in the non-thermocompression-bonded portion. An antibacterial nonwoven fabric containing the inorganic antibacterial agent particles and having the inorganic antibacterial agent particles exposed on the peeled surface of the fiber B (Basis weight: 50 g / m ² ) was obtained. The longitudinal tensile strength, transverse tensile strength, specific surface area and antibacterial performance of the thus obtained antibacterial nonwoven fabric were measured, and the results are shown in Table 1.

Example 2 An antibacterial nonwoven fabric was obtained in the same manner as in Example 1 except that the content of the inorganic antibacterial agent particles in the polymer component B was changed to 0.5% by weight. Various performances of this antibacterial nonwoven fabric were also as shown in Table 1.

Example 3 An antibacterial nonwoven fabric was obtained in the same manner as in Example 1 except that the content of the inorganic antibacterial agent particles in the polymer component B was 5.0% by weight. Various performances of this antibacterial nonwoven fabric were also as shown in Table 1.

[0037]

[Table 1]

Example 4 Polyethylene terephthalate having a melting point of 256 ° C. and a relative viscosity at 20 ° C. of 1.38 when dissolved in an equal amount mixed solvent of tetrachloroethane and phenol as the high melting point polymer component A using, to the polyethylene terephthalate, seawater, Institute for chemical Research, made of inorganic antimicrobial agent particles "product name: Sea Bio" (the main component is Ca _{0. 95} Zn
_0.05 (OH) ₂ ) 1.0 wt% was prepared. The inorganic antibacterial agent particle-containing polymer component A was prepared according to the masterbatch method adopted in Example 1. On the other hand, the low melting point polymer component B has a melting point of 132
A high-density polyethylene having a melt index value of 20 g / 10 minutes at 0 ° C. was prepared.

Polymer component A containing the above inorganic antibacterial agent particles
And a polymer component B were used to obtain an antibacterial nonwoven fabric in the same manner as in Example 1. Various performances of this antibacterial nonwoven fabric were also as shown in Table 1.

Example 5 Polyethylene terephthalate having a melting point of 256 ° C. and a relative viscosity of 1.38 at 20 ° C. when dissolved in an equal amount mixed solvent of tetrachloroethane and phenol as the high melting point polymer component A using, to the polyethylene terephthalate, seawater, Institute for chemical Research, made of inorganic antimicrobial agent particles "product name: Sea Bio" (the main component is Ca _{0. 95} Zn
A material containing _0.05 (OH) ₂ ) 0.5% by weight was prepared. The inorganic antibacterial agent particle-containing polymer component A was prepared according to the masterbatch method adopted in Example 1. On the other hand, the low melting point polymer component B has a melting point of 132
Using high-density polyethylene with a melt index value of 20 g / 10 minutes at ℃, to this high-density polyethylene,
Inorganic antibacterial agent particles manufactured by Seawater Chemistry Research Laboratory "Product name: Seabio" (main component is Ca _0.95 Zn _0.05 (OH) ₂ ) 0.5
The thing containing the weight% was prepared. The inorganic antibacterial agent particle-containing polymer component B was prepared according to the masterbatch method adopted in Example 1.

Polymer component A containing the above inorganic antibacterial agent particles
And an inorganic antibacterial agent particle-containing polymer component B,
Each of the composite spinning holes adopts a shape capable of obtaining a radial splittable conjugate fiber as shown in FIG. 3, and the inorganic antibacterial agent particle-containing polymer component A and the inorganic antibacterial agent particle-containing polymer component A are used. An antibacterial nonwoven fabric was obtained in the same manner as in Example 1 except that the composite ratio with B was 1/1. As described above, the thermocompression bonding portions are scattered, and at least the fiber A having a fineness of about 0.21 denier and the fiber B having a fineness of about 0.21 denier are developed in the non-thermocompression bonding portion.
An antibacterial non-woven fabric (Basis weight: 50 g / m ² ) was obtained in which the inorganic antibacterial agent particles were contained therein and the inorganic antibacterial agent particles were exposed on the peeled surfaces of the fibers A and B. Various performances of this antibacterial nonwoven fabric were also as shown in Table 1.

Example 6 As an inorganic antibacterial agent particle, Mg _0.90 Zn _0.10 O was used in place of “trade name: Novalon AG300” (silver zirconium phosphate) manufactured by Toagosei Kagaku Kogyo Co., Ltd. An antibacterial nonwoven fabric was obtained in the same manner as in 2. Various performances of this antibacterial nonwoven fabric were also as shown in Table 1.

Example 7 An antibacterial nonwoven fabric was prepared in the same manner as in Example 5 except that the same composite spinning holes as those used in Example 1 were used as the composite spinning holes in the method of Example 5. Obtained. As described above, the thermocompression-bonded portions are scattered, and at least the fiber A having a fineness of about 0.26 denier and the fiber B having a fineness of about 1.54 denier are developed in the non-thermocompression-bonded portion.
An inorganic antibacterial nonwoven fabric was obtained in which the inorganic antibacterial agent particles were contained therein, and the inorganic antibacterial agent particles were exposed on the peeled surfaces of the fibers A and B. Various performances of this antibacterial nonwoven fabric were also as shown in Table 1.

Example 8 Polyethylene terephthalate having a melting point of 256 ° C. and a relative viscosity at 20 ° C. of 1.38 when dissolved in an equal amount mixed solvent of tetrachloroethane and phenol as a high melting point polymer component A This polyethylene terephthalate was used to prepare 0.5% by weight of inorganic antibacterial agent particles "trade name: Apacider" (main component hydroxyapatite silver) manufactured by Sangi Co., Ltd. on the other hand,
As the low melting point polymer component B, the melting point is 225 ° C. and 96
Relative viscosity measured at 25 ° C. with concentrated sulfuric acid of 2.5% is 2.57
Nylon 6 is used, and on this nylon 6, inorganic antibacterial agent particles manufactured by Seawater Chemistry Laboratory "Product name: Sea Bio"
A material containing 0.5% by weight of (main component Al ₂ Mg ₅ ZnO) was prepared. The inorganic batch antibacterial agent particles were added to the polymer components A and B in an amount of 0.5% by weight according to the masterbatch method described in Example 1.

Polymer component A containing the above inorganic antibacterial agent particles
And the polymer component B containing the inorganic antibacterial agent particles were melted and introduced into the composite spinneret. Each composite spinning hole of the composite spinneret has a shape capable of obtaining a split hollow conjugate fiber having a radial cross section as shown in FIG. The single-hole discharge rate was 1.3 g / min, and the composite ratio [inorganic antibacterial agent particle-containing polymer component A / inorganic antibacterial agent particle-containing polymer component B (weight ratio)] was 1/1. Then, composite spinning was performed. The temperature of the polymer line depends on the polymer component A.
Is 285 ° C and that of polymer component B is 260 ° C.
Then, a spinning temperature of 285 ° C. was applied.

Next, the spun yarn spun from the composite spinneret is cooled by a cooling device, and then 150 cm below the spinneret.
3 of these yarns in the air soccer group arranged at the position
The fiber was taken out at 800 m / min, the split-type composite long fiber group was opened by a known fiber-opening device, and then deposited on a moving wire mesh collection conveyor to obtain a fiber web. The basis weight of this fibrous web was about 50 g / m ² , and the fineness of the splittable composite continuous fiber group constituting the fibrous web was about 3 denier. Then, this fibrous web was introduced into an embossing device composed of an engraving roll and a smooth roll heated to 220 ° C., and heat was partially applied to provide a thermocompression bonding part. The area of each thermocompression bonding part was 0.68 mm ² , the ratio of the total area of the thermocompression bonding parts to the surface area of the fibrous web was 7.6%, and the density of the thermocompression bonding parts was 16.0 pieces / cm ^2. It was

Next, the fibrous web provided with the thermocompression bonding portion is subjected to a kneading process using a loco-type jet dyeing machine (manufactured by Hokuriku Co., Ltd.) to obtain a polymer component A and a polymer component of the splittable composite long fiber. Polymer component A containing inorganic antibacterial agent particles is peeled off from B
A fiber A and a polymer component B containing inorganic antibacterial agent particles
The fiber B was made to express. Simultaneously with the rubbing process, nylon 6 (polymer component B) was dyed. The dyeing conditions were as follows: Blue FFB (manufactured by Sumitomo Chemical Co., Ltd.) as an acid dye of 0.2% o. w. f. , Migregar WA-10 (manufactured by Senka) as a leveling agent, 0.5 g / l,
It was carried out using 2000 liters of an aqueous solution in which acetic acid was dissolved to have a pH of 5. The jet dyeing conditions are: liquid temperature 100 ° C., speed 100 m / min, nozzle pressure 3 k
The treatment was performed at g / cm ² for 1 hour. Then, it is dehydrated and dried, and the thermocompression bonding portions are scattered, and in the non-thermocompression bonding portion, at least fiber A having a fineness of about 0.19 denier and fiber B having a fineness of about 0.19 denier are developed. An antibacterial nonwoven fabric was obtained in which the inorganic antibacterial agent particles were contained in the fiber B, and the inorganic antibacterial agent particles were exposed on the peeled surfaces of the fibers A and B. The various properties of the antibacterial nonwoven fabric obtained as described above were as shown in Table 1.

Comparative Example 1 Polyethylene terephthalate having a melting point of 256 ° C. and a relative viscosity of 1.38 at 20 ° C. when dissolved in an equal amount mixed solvent of tetrachloroethane and phenol was used. Inorganic antibacterial agent particles "trade name: Novalon AG300" (silver zirconium phosphate) manufactured by Toagosei Chemical Industry Co., Ltd. (5.0% by weight) were prepared. In addition, in order to add 5.0% by weight of the inorganic antibacterial agent particles to polyethylene terephthalate, the masterbatch method described in Example 1 was followed. The polyethylene terephthalate containing the inorganic antibacterial agent particles was melted and introduced into the spinneret. Each spinning hole of the composite spinneret has a shape such that a fiber made of a single component having a round cross section can be obtained. Then, the single hole discharge rate was set to 1.3 g / min, and 285 ° C. was applied to both the temperature of the polymer line and the spinning temperature.

Next, the spun yarn spun from the spinneret is cooled by a cooling device, and then the yarn is spun at 380 with an air sucker group placed 150 cm below the spinneret.
The fiber group was taken out at 0 m / min, the long fiber group was opened by a known fiber opening device, and then the fiber group was deposited on a moving wire mesh collecting conveyor to obtain a fiber web. The basis weight of this fibrous web is about 50 g /
m ² and the fineness of the composite long fiber group constituting the fibrous web was about 3.1 denier. Then, this fibrous web was introduced into an embossing device consisting of an engraving roll and a smooth roll heated to 240 ° C., and partially heated by the same method as in Example 1 to provide a thermocompression bonding part. The various properties of the antibacterial nonwoven fabric obtained as described above were as shown in Table 1.

Comparative Example 2 As an inorganic antibacterial agent particle, an inorganic antibacterial agent particle manufactured by Seawater Chemical Research Laboratory "trade name: C-Bio" (main component is Ca _0.95 Z
n _0.05 (OH) ₂ ) was used and the content in polyethylene terephthalate was 0.5% by weight.
An antibacterial nonwoven fabric was obtained by the same method as in Comparative Example 1. The various performances of this antibacterial nonwoven fabric were as described in Table 1.

As is clear from comparison between Examples 1 to 8 and Comparative Examples 1 and 2, the antibacterial nonwoven fabrics obtained by the methods of Examples 1 to 8 have markedly improved antibacterial performance. I know that The reason for this is that when the splittable conjugate fiber containing the inorganic antibacterial agent particles is peeled (divided splitting), the inorganic antibacterial agent particles are exposed on the peeled surface of each peeled component. On the other hand, when the non-dividable fiber is used, the contained inorganic antibacterial agent particles are
It exists only inside the fiber and tends not to be exposed on the fiber surface. This derives from the fact that fibers are produced by the melt spinning method. Therefore, when non-dividable fiber is used, even if a large amount of inorganic antibacterial agent particles are present,
The antibacterial performance tends not to be improved so much.

[0052]

As described above, the antibacterial non-woven fabric according to the present invention uses the splittable conjugate fiber containing the inorganic antibacterial agent particles inside, and peels the splittable conjugate fiber (split split fiber). Therefore, one surface of the inorganic antibacterial agent particles is exposed on the peeling surface and is brought into contact with the outside air, whereby the antibacterial performance is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a splittable conjugate fiber used in the present invention.

FIG. 2 is a cross-sectional view showing an example of a splittable conjugate fiber used in the present invention.

FIG. 3 is a cross-sectional view showing an example of a splittable conjugate fiber used in the present invention.

FIG. 4 is a cross-sectional view showing an example of a splittable conjugate fiber used in the present invention.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location D01F 1/10 D01F 1/10 8/04 8/04 Z // D04H 1/42 D04H 1/42 X

Claims (9)

[Claims] 1. A non-woven fabric obtained from a splittable conjugate fiber obtained by laminating a polymer component A and a polymer component B, which is incompatible with the polymer component A, in the non-woven fabric. , At least a part of the splittable conjugate fiber has a bond between the polymer component A and the polymer component B peeled off, and a fiber A made of the polymer component A and a fiber B made of the polymer component B are developed. The release surface of the fiber A and / or the fiber B is
An antibacterial nonwoven fabric characterized by the presence of inorganic antibacterial particles. 2. The antibacterial nonwoven fabric according to claim 1, wherein the splittable conjugate fiber is a splittable conjugate filament. 3. The melting point of the polymer component B in the splittable conjugate fiber is lower than the melting point of the polymer component A, and the splittable composite fiber is softened or melted in the nonwoven fabric. The antibacterial non-woven fabric according to claim 1 or 2, wherein the thermocompression bonded portions in which the fibers are bonded to each other are scattered. 4. The active ingredient of the inorganic antibacterial agent is zirconium phosphate silver, zeolite silver, Ca _0.95 Zn _0.05 (OH)
₂ , Ca _0.95 Cu _0.05 (OH) ₂ , Cu _0.67 Al _0.33 O,
Mg _0.93 Cu _0.07 O, Mg _0.90 Zn _0.10 O, Al ₂ Mg ₃
ZnO, antibacterial nonwoven fabric according to any one of claims 1 to 3 is at least one or more selected from the group consisting of Al ₂ Mg ₅ ZnO. 5. The fineness of the fiber A and / or the fiber B is 0.
The antibacterial nonwoven fabric according to any one of claims 1 to 4, which has a denier of 05 or more. 6. An inorganic antibacterial agent particle is mixed into the polymer component A and / or the polymer component B, and the melted polymer component A and the polymer component B are discharged from a composite spinneret,
After obtaining the splittable composite continuous fiber obtained by laminating the polymer component A and the polymer component B, the splittable composite continuous fiber is deposited on the collecting surface to obtain a fiber web, and then, At least one of the splittable composite filaments existing outside the thermocompression-bonded portion is obtained by partially applying heat to the fibrous web to disperse the thermocompression-bonded portions in which the splittable composite filaments are bonded to each other. Part, the polymer component A and the polymer component B are peeled off, and the fiber A made of the polymer component A and the fiber B made of the polymer component B are developed. Manufacturing method. 7. The melting point of the polymer component B is lower than that of the polymer component A, and the splittable composite continuous fibers are bonded to each other by softening or melting of the polymer component B in the thermocompression bonding portion. The method for producing an antibacterial nonwoven fabric according to claim 6. 8. An active ingredient of an inorganic antibacterial agent is zirconium phosphate silver, zeolite silver, Ca _0.95 Zn _0.05 (OH)
₂ , Ca _0.95 Cu _0.05 (OH) ₂ , Cu _0.67 Al _0.33 O,
Mg _0.93 Cu _0.07 O, Mg _0.90 Zn _0.10 O, Al ₂ Mg ₃
The method for producing an antibacterial nonwoven fabric according to claim 6 or 7, which is at least one kind or two or more kinds selected from the group consisting of ZnO and Al ₂ Mg ₅ ZnO. 9. The fineness of the fibers A and / or fibers B is 0.
The method for producing an antibacterial nonwoven fabric according to any one of claims 6 to 8, which has a denier of not less than 05.