JPH08205985A - Production of antimicrobial matting - Google Patents

Abstract

PURPOSE: To make it possible to obtain matting which exhibits the excellent antimicrobial property possessed by antimicrobial fibers by improving the antimicrobial effect degraded after repeating of washing and backing of the matting consisting of the antimicrobial fibers deposited with a silver based inorg. antimicrobial agent. CONSTITUTION: The matting having the antimicrobial fibers deposited with the silver based inorg. antimicrobial agent expressed by the following formula is formed by backing the matting with a backing material and bringing the matting into contact with a bleaching agent. Aga Ab M2 (PO4 )3 .nH2 O. [A is at least one kind of ions selected from an alkali metal ion, alkaline earth metal ion, hydrogen ion and ammonium ion (valence of ion is defined as (m); M is a quadrivalent metal; (n) is a number satisfying 0<=n<=6; (a) and (b) are positive numbers satisfying a+mb=1].

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing and treating an antibacterial rug capable of sufficiently exhibiting the original antibacterial effect of an antibacterial fiber carrying a silver-based inorganic antibacterial agent. The antibacterial rug obtained according to the present invention is a mat or a carpet used in hospitals, general houses, hotels, food factories, kitchens, restaurants, research laboratories, libraries, bathhouses, automobiles and aircrafts, which require cleanliness or antibacterial properties. -It can be effectively used as a rug for pets and the like.

[0002]

2. Description of the Related Art A number of antibacterial agents have already been proposed which can be incorporated into fibers, paints, resin moldings, papers, binders and the like to exert antibacterial properties. Among them, inorganic antibacterial agents are excellent in durability. Recently, it has been attracting attention. Most inorganic antibacterial agents are those in which silver ions are supported on the inorganic compound by various methods in order to exert antibacterial properties. As the inorganic compound supporting silver ions, for example, activated carbon,
There are apatite, zeolite, various phosphates, etc. Fibers carrying a silver-based inorganic antibacterial agent carrying silver ions have excellent antibacterial activity, so clothing, bedding, cartons,
It has been applied to various textile products such as towels.
It has been attempted to impart antibacterial properties to a rug by supporting a silver-based inorganic antibacterial agent on fibers forming the rug. On the other hand, in the production of rugs, there is a backing process as a process for the purpose of preventing slippage and deformation of the rug. By this process, a tufted material is backed with a backing material such as EVA, vinyl chloride or rubber latex. Or backing material such as rubber is lined. Some rugs have a backing and some do not do this processing. In those without a backing, the antibacterial activity of the antibacterial fiber can be sufficiently exerted, and the cotton fiber or the chemical fiber has an antibacterial agent. Various rugs, such as towel mats made of antibacterial fibers supporting the above, are manufactured.

The followings are known as techniques relating to antibacterial fibers. When a zeolite carrying silver ions is contained in an organic polymer-based synthetic fiber, there is a problem that the antibacterial property of the synthetic fiber decreases after several months have passed since spinning. There is known a method in which a synthetic fiber containing zeolite carrying silver ions is treated with an aqueous solution of hypochlorite and/or hydrogen peroxide at a certain time (Japanese Patent Laid-Open No. 61-13653).
No. 0). Further, as an antibacterial agent having extremely excellent physical and chemical stability, a tetravalent metal phosphate antibacterial represented by the following general formula is known (JP-A-3-83905). The contained resin composition can be used for textiles and is known to have antifungal, antibacterial and antialgal properties for a long time even in a severe environment (Japanese Patent Laid-Open No. 4-275370). .. Ag _{a Ab} M ₂ (PO ₄ ) ₃ ·nH ₂ O [A is an alkali metal ion, an alkaline earth metal ion,
It is at least one kind of ion selected from hydrogen ion and ammonium ion (the valence of which is m), M is a tetravalent metal, n is a number satisfying 0≦n≦6, and a
And b are positive numbers that satisfy a+mb=1. ]

[0004]

Among the above-mentioned antibacterial textiles, after repeating the heating step after latex application, weather resistance test, leaving in an undried state and repeating washing, and also for vinyl chloride resin and rubber. During the process of backing such a reinforcing material, it was often found that the originally excellent antibacterial activity of the antibacterial fiber was reduced. The present invention is a rug comprising an antibacterial fiber carrying a silver-based inorganic antibacterial agent, which improves the antibacterial effect lowered after repeated washing and backing, and exhibits the original excellent antibacterial property of the antibacterial fiber. The present invention provides a manufacturing method and a processing method capable of obtaining

[0005]

[A is at least one ion selected from an alkali metal ion, an alkaline earth metal ion, a hydrogen ion and an ammonium ion (the ionic valence is m), M is a tetravalent metal, and n is 0≦n It is a number that satisfies ≦6, and a and b are positive numbers that satisfy a+mb=1. ]

The present invention will be described in detail below. O Silver-based inorganic antibacterial agent The silver-based inorganic antibacterial agent in the present invention is a silver-based inorganic antibacterial agent represented by the following general formula [1]. Ag _{a Ab} M ₂ (PO ₄ ) ₃ ·nH ₂ O [1] [A is an alkali metal ion, an alkaline earth metal ion,
It is at least one kind of ion selected from hydrogen ion and ammonium ion (the valence of which is m), M is a tetravalent metal, n is a number satisfying 0≦n≦6, and a
And b are positive numbers that satisfy a+mb=1. This silver-based inorganic antibacterial agent is already known (for example, JP-A-3-83905), is a crystalline compound belonging to the space group R3c, and each constituent ion forms a three-dimensional network structure. .. This silver-based inorganic antibacterial agent is a physically and chemically stable compound, has antifungal, antibacterial and antialgal properties for a long time even in a harsh environment, and is used when processing fibers. It is excellent in that the degree of discoloration is small even when it is brought into contact with various treatment liquids.

A in the above general formula [1] is at least one ion selected from alkali metal ions, alkaline earth metal ions, hydrogen ions and ammonium ions (with an ionic valence of m), and preferred ions are: It is an alkali metal ion and a hydrogen ion because a compound having excellent antibacterial activity can be easily and inexpensively obtained. M in the above general formula [1] is a tetravalent metal, preferred metals are Ti, Zr, Sn and the like, and Zr is a particularly preferred metal because a compound having excellent antibacterial properties can be easily obtained.

The following are specific examples of the above general formula [1]. Ag _0.005 Li _0.995 Zr ₂ (PO ₄ ) ₃ Ag _0.01 (NH ₄ ) _0.99 Zr ₂ (PO ₄ ) ₃ Ag _0.05 Na _0.95 Zr ₂ (PO ₄ ) ₃ Ag _0.2 K _0.8 Ti ₂ (PO ₄ ) ₃ Ag _0.1 H _0.9 Zr ₂ (PO ₄ ) ₃ Ag _0.05 H _0.05 Na _0.90 Zr ₂ (PO ₄ ) ₃ Ag _0.05 H _0.05 Ca _0.45 Zr ₂ (PO ₄ ) ₃ Ag _0.05 H _0.05 Mg _0.45 Zr ₂ (PO ₄ ) ₃ Ag _0.05 H _0.55 Na _0.40 Zr ₂ (PO ₄ ) ₃ Ag _0.20 H _0.40 Na _0.40 Zr ₂ (PO ₄ ) ₃

In order to exhibit antifungal, antibacterial and antialgal properties, the larger the value of a in the general formula [1] is, the better.
When the value of a is 0.001 or more, antifungal, antibacterial and antialgal properties can be sufficiently exhibited. The value of a is 0.
If it is less than 01, it may be difficult to exert antifungal, antibacterial and antialgal properties for a long time, and in consideration of economic efficiency, the value of a is 0.01 or more and 0.5 or less. It is preferable that

The method for producing the silver-based inorganic antibacterial agent represented by the above general formula [1] (hereinafter, simply referred to as antibacterial agent) is not particularly limited, but the preferred production method is the following general formula [2].
The method is to obtain a tetravalent metal phosphate compound represented by and then carry silver ions on it. A _x M(PO ₄ ) ₃ ·nH ₂ O [2] [A is an alkali metal ion, an alkaline earth metal ion,
At least one kind of ion selected from hydrogen ion and ammonium ion (the ionic value is m), M is a tetravalent metal, n is a number satisfying 0≦n≦6, and x
Is 1/m. ]

The method for supporting silver ions is not particularly limited, and any of the supporting methods known so far can be adopted.
For example, a method of supporting by physical adsorption or chemical adsorption, a method of supporting by an ion exchange reaction, a method of supporting by a binder, a method of supporting by injecting a silver compound into an inorganic compound, vapor deposition, dissolution precipitation reaction, thin film formation such as sputtering. There is a method of supporting by forming a thin layer of a silver compound on the surface of an inorganic compound by a method.

A tetravalent metal phosphate compound represented by the above general formula [2] (hereinafter abbreviated as a tetravalent metal phosphate compound [2]).
There are a calcination method, a wet method, a hydrothermal method, and the like as a method for synthesizing, and, for example, when synthesizing by a wet method, it can be easily obtained as follows. While stirring the aqueous solution of zirconium oxynitrate and sodium nitrate, oxalic acid and phosphoric acid are added thereto. The pH of the reaction solution was adjusted to about 3.5 with an aqueous solution of caustic soda, and after heating and refluxing for about 78 hours, the precipitate was filtered, washed with water, dried and crushed, and reticulated zirconium phosphate [NaZr ₂ (PO ₄ ) ₃ ] To get An antibacterial agent is obtained by immersing this in an aqueous solution containing silver ions at an appropriate concentration.

In order to improve the chemical and physical stability of the antibacterial agent and to obtain an antibacterial agent with a high degree of prevention of discoloration, the tetravalent metal phosphate compound [2] should be supported before loading silver ions or It is preferable to calcine the tetravalent metal phosphate compound [2] after supporting silver ions, and more preferably, 500 to 1300° C. after supporting the tetravalent metal phosphate compound [2] with silver ions. , And more preferably 600 to
Baking is performed at 1000° C., particularly preferably 700 to 900° C.

○ Antibacterial Fiber The raw material fiber of the antibacterial fiber in the present invention is not particularly limited, and specifically, it may be cellulose such as viscose or cupra.
Regenerated and semi-synthetic fibers such as regenerated silk, alginic acid, etc., and protein type such as milk-based and milk protein, soy protein; synthetic fibers such as polyamide, polyester, polyvinyl, polyacrylic, polyurethane, polyethylene, polyvinylidene, polystyrene; cotton, hemp There are natural fibers such as silk, wool, cashmere and mohair. Further, in the present invention,
Straw, rush, sedge, bamboo and the like, which are fibrous materials capable of forming a rug like the above-mentioned raw fibers, can also be used as raw fibers. In the present invention, the above-mentioned various raw material fibers can be used alone, or a plurality of appropriately selected raw material fibers can be used in combination as necessary. The antibacterial fiber in the present invention is a raw material fiber carrying the above antibacterial agent. The method for obtaining this is not particularly limited, and for example, an antibacterial agent may be directly kneaded into the resin of the raw material fiber and spun, or may be applied to the surface of the raw material fiber by coating, depping or the like. The spinning method includes melt spinning, wet spinning and dry spinning, and is not particularly limited. The preferable loading amount of the antibacterial agent on the raw material fibers is 0.05 to 5% by weight in the case of kneading processing, and 0.01 to 5 g/m ² in the case of coating processing. It is possible to obtain an antibacterial fiber having It should be noted that, if the surface of the antibacterial fiber is only dyed with a dye, the color may be lost by the bleaching treatment in the present invention, and therefore the fiber is preferably dyed by pigmenting (coloring the fiber itself).

○ Rug The rug according to the present invention is made of antibacterial fiber and is backed with a backing material. The backing material is used to prevent the fibers from falling out of the rug, or to prevent the rug from slipping or losing its shape. For example, EV
A, latex such as vinyl chloride, rubber or the like, or acrylic resin, thermoplastic resin such as vinyl chloride or urethane. In order to obtain a rug having a high antibacterial property, it is preferable to use only the antibacterial fiber as the fiber, but various fibers which do not carry the antibacterial agent may be appropriately used in combination depending on the application of the rug. Specific rugs include carpets, mats, mats, rugs, mats, flowers, and the like, but carpets and mats for which the bleaching treatment in the present invention is particularly effective are rugs.

Bleaching agent The bleaching agent used in the present invention is not particularly limited and may be either an oxidizing bleaching agent or a reducing bleaching agent. Specific examples of preferable bleaching agents include hydrogen peroxide and percarbonate
Da, sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, sodium chlorite, potassium chlorite, calcium chlorite, bleached powder, chlorinated isocyanuric acid and the like. Among these bleaching agents, the chlorine-based bleaching agent may deteriorate the quality of the fiber or reduce the antibacterial effect of the antibacterial agent depending on the treatment conditions. Therefore, a preferred bleaching agent is an oxidizing bleaching agent. It is a kind of hydrogen peroxide and sodium percarbonate. Further, various stabilizers such as sodium silicate, magnesium salt, calcium salt, sodium bentonite and organopolysiloxane; pH adjusting agents such as potassium hydroxide, sodium hydroxide and ammonia;
Surfactants; detergents and the like can also be used in combination with the bleaching agent.
Particularly, in the case of bleaching with a hydrogen peroxide solution, the pH is about 10
High bleaching effect is exhibited in 12 alkaline regions,
It is preferable to use a pH adjusting agent together.

Bleaching treatment The bleaching treatment in the present invention is carried out by backing a rug made of antibacterial fibers with a backing material and then contacting it with a bleaching agent. Even if the bleaching treatment is carried out immediately after spinning or before backing with a backing material, the antibacterial properties of the antibacterial fiber will decrease due to repeated heating during the backing process.

With respect to the antibacterial fiber carrying the zeolite antibacterial agent, a technique of bleaching the antibacterial fiber at an early stage after spinning is used as a means for preventing the antibacterial activity from decreasing to about half after spinning for several months. However, the antibacterial rug according to the present invention has the original antibacterial property of the antibacterial agent and the antibacterial fiber immediately after backing or after repeated washing, not after spinning. Since the antibacterial agent in the present invention is a tetravalent metal phosphate antibacterial agent, and the antibacterial agent has a completely different chemical composition and crystal structure from the zeolite antibacterial agent, it is bleached. Considering that is a kind of chemical reaction, it is surprising that the bleaching treatment in the present invention can restore the antibacterial activity of the antibacterial rug by about 100%.

The method of contacting the bleaching agent is not particularly limited, and methods such as a dipping method and a pad steam method known as a general bleaching method can be used. The dipping method is a method of immersing a rug in an aqueous bleaching agent solution, and the pad steam method is a method of exposing the rug to heated steam containing a bleaching agent. The treatment in the present invention may be carried out at any time after the backing, and can be carried out at the first washing after the backing, or at an appropriate time before the use and after the use of the rug. Considering the handling method of the rug, it is desirable that this bleaching treatment is performed immediately after the rug is manufactured or when the rug is washed after being used for a certain period of time. The treatment conditions are not particularly limited, and the treatment time can be changed by adjusting the conditions such as the bleaching agent concentration and the treatment temperature depending on the kind of the bleaching agent used. For example, in the case of the dipping method, a preferable processing temperature is from room temperature to 150° C., more preferably 50 to 70° C., and a preferable processing time is several tens of seconds to 1 hour. After the treatment, it is desirable to sufficiently wash with water so that the bleach does not remain and the rug does not turn yellow. The preferred concentration of the aqueous bleaching agent used in the bleaching treatment is
It is 0.05 to 5% by weight. If it is less than 0.05% by weight, it is not easy to improve the antibacterial property of the rug and it is 5% by weight.
If it is used at a higher concentration, the rug may deteriorate during use, and the effect of improving antibacterial activity does not improve,
Not economical.

The antibacterial rug thus obtained has improved antibacterial activity which has been reduced during repeated washing and backing steps, and has excellent antibacterial, antifungal and antialgal properties over a long period of time.

By the production method of the present invention, various antibacterial rugs having antifungal, antialgal, and antibacterial properties can be produced. These antibacterial rugs are placed at the entrance or entrance of a room, and footwear is used. It has effects such as wiping dirt and laying it on the floor to soften the impact that a person or equipment receives from the floor, and can be used in a wide range of applications as described below. That is, hospital, hotel, general house, food factory, laboratory, library, bathhouse, restaurant, kitchen, car, aircraft, clean room, museum mat, doorway mat, footrest mat, ornament storage mat or indoor cabinet. -Rugs for pets and the like.

[0022]

The detailed mechanism is not clear as to the reason why the antibacterial activity of the rug, which has been lowered after repeated washing and backing steps, can be improved by the production method of the present invention. I'm estimating. That is, the antibacterial fiber is a component of the detergent or a stabilizer component of the fiber during heating at the time of backing, or any interfering component contained in the backing material is gasified or eluted, and the antibacterial fiber In order to adhere by chemical affinity on the surface,
The antibacterial activity of the antibacterial fiber will be reduced. Therefore, when the antibacterial fiber with the interfering component attached is brought into contact with the bleaching agent, the interfering component attached to the surface of the antimicrobial fiber is removed,
After bleaching, the original antibacterial property of the antibacterial fiber is exhibited in the rug. In particular, in nylon fibers that are widely used as rug fibers, stabilizers of copper iodide and hindered amine compounds are used as additives to improve weather resistance and heat resistance of nylon fiber resins. It is also possible that the component of the above is a factor that reduces the antibacterial activity, and conventionally, in order to prevent the antibacterial activity of the antibacterial fiber from decreasing, the method of increasing the amount of silver-based antibacterial agent has been taken, but the cost increase It was inevitable that the texture would deteriorate. In the present invention, since the antibacterial activity of the rug can be improved, the antibacterial activity of the antibacterial fiber should be improved as a matter of course, and in the rug using nylon fiber, the bleaching treatment of the present invention is performed. At the same time, it is considered that the above-mentioned stabilizer compounded in the resin for nylon fiber reduces the problem of the antibacterial activity of the antibacterial fiber.

Hereinafter, the present invention will be described more specifically by way of examples.

【Example】

Reference Example 1 [Preparation of antibacterial agent] An aqueous solution of zirconium sulfate and an aqueous solution of sodium dihydrogen phosphate were mixed at a ratio of zirconium to phosphorus of 2:3 to form a precipitate, and an aqueous solution of sodium hydroxide was added. After the pH was adjusted to 2 by using it, crystalline zirconium phosphate was obtained by heating at 150° C. for 24 hours under hydrothermal condition. The tetravalent metal phosphate compound obtained above was added to an aqueous solution of silver nitrate, stirred at room temperature for 4 hours, thoroughly washed with water and dried. The powder obtained as described above,
After firing at 800° C. for 4 hours, it was lightly crushed to obtain an antibacterial agent. The obtained antibacterial agent is a white powder having an average particle size represented by the following formula of 0.47 μm. Ag _0.15 Na _0.5 H _0.35 Zr ₂ (PO ₄ ) ₃

Reference Example 2 [Preparation of rug] The antibacterial agent obtained in Reference Example 1 was blended at a ratio of 0.5 part per 100 parts by weight of the nylon fiber resin (hereinafter simply referred to as "part") and melt-spun by a conventional method. As a result, about 5 denier antibacterial nylon fiber was obtained. Bundling this antibacterial fiber,
After flocking a yarn with a thickness of about 1 mm to a non-woven fabric, apply latex from the back, and further stick a rubber sheet with a thickness of about 1 mm as a backing material and heat-bond it,
A mat was made. For comparison, a mat was prepared by the same method using nylon fibers that did not carry an antibacterial agent.

Example 1 [Production of antibacterial mat] The mat produced in Reference Example 2 was treated at a treatment temperature of 40 to 120°C.
Sample Nos. 1 to 10 were prepared by immersing in a treatment solution consisting of a bleaching agent, a pH adjuster/stabilizer, and a detergent under a treatment time of 5 to 60 minutes, and then thoroughly washing with water and drying. The sample No. corresponds to the process No.). The processing conditions at this time are shown in Tables 1 and 2. Further, the same treatment was carried out using the ordinary mat prepared for comparison in Reference Example 2 to prepare Comparative Samples Nos. 1 to 10 (however, Comparative Samples
No. corresponds to the processing No.).

[0026]

[Table 1] Note) The unit of concentration is% by weight.

[0027]

[Table 2] Note) The unit of concentration is% by weight.

Example 2 [Evaluation of antibacterial property of antibacterial rug] Samples No. 1 to 10 obtained in Example 1 and comparative sample No. 1
-10, the mat before bleaching obtained in Reference Example 2, and the fiber immediately after spinning used for the mat (however, the sample is an antibacterial nylon fiber, and the comparative sample is a nylon not carrying an antibacterial agent. Fiber), the mat before the bleaching treatment obtained in Reference Example 2 was washed 100 times (mat A), and the mat before the bleaching treatment obtained in Reference Example 2 was 100 times.
An antibacterial activity test was conducted on the bleached product (Matte B) after being washed twice as follows. Also, in order to obtain reference data showing that the antibacterial properties of the rug decrease after backing are not due to the high temperature exposure of the antibacterial nylon fibers during backing, the antibacterial nylon fibers used in the mat were 30 at the heat fusion temperature
The antibacterial evaluation was also performed on the one left for a minute. Immediately after spinning, 1 g of the antibacterial nylon fiber was used as a test sample, and 1 g of the mat was used as a test product. Put the test product in 15 ml of the phosphate buffer solution in the Erlenmeyer flask, and further add about 10 ⁵ Staphylococcus aureus/1
The bacterial solution was added so that the amount became ml. After shaking at 27° C. for 1 hour, 1 ml of the test solution was taken, and the viable cell count was measured by the pour plate culture method (36° C., 1 day) using a standard agar medium. The results of measuring the viable cell count are shown in Tables 3 and 4. In addition,
The washing conditions for the mat A and the mat B and the bleaching condition for the mat B are as follows. (Washing conditions): Washing-drying steps of washing for 10 minutes in an aqueous solution of 0.1 wt% alkaline detergent at 50° C., followed by dehydration and drying are repeated 100 times. (Bleaching conditions): Treatment No. of Table 1 above. Same as 1.

[0029]

[Table 3]

[0030]

[Table 4]

Note) In the above table, Mat A represents the unbleached mat obtained in Reference Example 2 that was washed 100 times, and Mat B represents the unbleached mat obtained in Reference Example 2 in 100%.
Represents those that have been bleached after washing twice. Further, BT represents the heat fusion temperature at the time of backing.

As can be seen from Table 4, the antibacterial nylon fiber used for the mat immediately after spinning and the antibacterial nylon fiber heated at the temperature exposed during backing have excellent antibacterial properties. The mat which has not been bleached has a low antibacterial effect and is not sufficient, but as can be seen from Tables 3 and 4, the bleached sample No. 1 to
No. 10 showed an excellent antibacterial property. From the above results, the antibacterial property of the rug decreases after backing, not because the antibacterial fiber is exposed to high temperature during backing, but because some interfering component generated from the backing material adheres to the surface of the antibacterial fiber. Therefore, it can be seen that the lowered antibacterial property can be improved only by the bleaching treatment after the backing. Also, it can be seen that the antibacterial property is lowered in the mat after repeated washing, but the antibacterial property can be enhanced by bleaching the mat.

[0033]

INDUSTRIAL APPLICABILITY The antibacterial rug obtained by the production method of the present invention can improve the antibacterial effect reduced during repeated washing and backing, and can exhibit the original excellent antibacterial property of the antibacterial fiber. .. Further, due to the action of the antibacterial agent carried on the antibacterial fiber, the antibacterial rug obtained by the present invention has antifungal, antibacterial and algae preventing properties for a long period of time even in a severe environment.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // D06L 3/02 (72) Inventor Takashi Suzuki 1-1 Funami-cho, Minato-ku, Nagoya-shi, Aichi Toagosei Co., Ltd. Nagoya Research Institute (72) Inventor Hideki Kato 1-1 Funami-cho, Minato-ku, Aichi Prefecture Nagoya City Toagosei Co., Ltd. Nagoya Research Institute

Claims (2)

[Claims] 1. A rug made of antibacterial fibers carrying an inorganic silver antibacterial agent represented by the following general formula [1] is backed with a backing material and then brought into contact with a bleaching agent. Method of manufacturing antibacterial rug. Ag _{a Ab} M ₂ (PO ₄ ) ₃ ·nH ₂ O [1] [A is an alkali metal ion, an alkaline earth metal ion,
It is at least one kind of ion selected from hydrogen ion and ammonium ion (the valence of which is m), M is a tetravalent metal, n is a number satisfying 0≦n≦6, and a
And b are positive numbers that satisfy a+mb=1. ] 2. A rug made of an antibacterial fiber carrying an inorganic silver antibacterial agent represented by the general formula [1] according to claim 1, backed by a backing material, and a bleaching agent at the time of washing. A method for treating an antibacterial rug, which is characterized by bringing them into contact with each other.