Antibacterial treatment method for fiber, method for producing antibacterial fiber and antibacterial fiber

a fiber and treatment method technology, applied in the direction of electric/magnetic/electromagnetic heating, disinfection, liquid/solution decomposition chemical coating, etc., can solve the problems of increasing the cost, poor antibacterial effect, harmful effects on the fiber, etc., and achieves low cost and high resistance to washing

Inactive Publication Date: 2011-06-09
OSAKA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0055]According to the present invention, antibacterial metal nanoparticles can be made to firmly adhere to the surface of fiber easily at low cost without using a resin binder, and hence, antibacterial fiber with high resistance against washing can be provided.
[0056]Now, an embodiment of the invention will be described with reference to examples. It is noted that the invention is not limited to the embodiment described below. It is possible to make various modifications on the embodiment described below within a range the same as or equivalent to the present invention.

Problems solved by technology

Therefore, in antibacterial fiber produced by the kneading method, the antibacterial effect is poor considering the added amount, since a portion of the antibacterial agent kneaded inside the fiber does not make a large contribution to the antibacterial effect.
When a larger amount of antibacterial agent is kneaded in order to improve the antibacterial effect, it is apprehended that the additional amount can harmfully affect the fiber, for example, the material of the fiber may be changed in its properties, and in addition, there arises a problem of increase of the cost.
When it is repeatedly washed, however, the adhered antibacterial agent is peeled off, and therefore, the antibacterial performance attained after repeated washing is largely degraded with the exception of some organic antibacterial agents (that are chemically bonded to a reaction group of fiber).
When the amount of antibacterial agent to be added is increased or a resin binder is used, however, the cost is increased, and hence, the advantage in the cost to the kneading method is spoiled as well as there arises a problem that processing characteristics of the post-processing or the texture of a resultant product is degraded.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

a. Example 1

(1) Preparation of Antibacterial Fiber Sample

[0058]A silver nitrate aqueous solution obtained by adding silver nitrate to 800 mL of water so as to attain a concentration of 0.1 mM was put in a 1-L plastic bottle, and 8 mL of 2-propanol was further added thereto for accelerating the reduction reaction of silver ions. In the thus obtained aqueous solution, 8.6 mg of silver is present in the form of ions.

[0059]A commercially available cotton cloth (with a size of 50 cm×50 cm) was immersed in the resultant aqueous solution, and the plastic bottle was sealed and irradiated with cobalt-60 γ rays by using cobalt-60 γ irradiation equipment with stirring under the following conditions:

[0060]Radiation Source: Cobalt-60 γ source (with energy of γ ray photon of 1.25 MeV)

[0061]Source Strength: approximately 7000 curie

[0062]Dose Rate: 3 kGy / h

[0063]Irradiation Time: 2 hours

[0064]Thereafter, the cotton cloth was taken out of the plastic bottle, washed with water and dried, and thus, an ...

examples 2 through 5

2. Examples 2 through 5

[0072]In the following examples, silver ions were used as the noble metal ions, and the relationship between the concentration and the antibacterial property was tested.

[0073](1) Preparation of Samples

[0074]A silver nitrate aqueous solution obtained by adding silver nitrate to 1 L of water so as to attain each concentration shown in Table 2 was put in a vessel, and 1 vol % of 2-propanol was further added thereto for accelerating the reduction reaction of silver ions.

[0075]A commercially available cotton cloth (with a size of 50 cm×50 cm) was immersed in each of the resultant aqueous solutions, and the vessel was sealed and irradiated with cobalt-60 γ rays at an absorbed dose of 10 kGy (10000 J / kg) by using the same cobalt-60 γ irradiation equipment as in Example 1. It is noted that the aqueous solution was not stirred during the irradiation. Thereafter, the cotton cloth was taken out of the vessel, washed with water and dried to obtain a sample of each of Exam...

examples 6 through 10

3. Examples 6 through 10

[0079]In the following examples, silver ions were used as the noble metal ions, and the relationship between the absorbed dose and the antibacterial property was tested.

[0080](1) Preparation of Samples

[0081]A silver nitrate aqueous solution obtained by adding silver nitrate to 1 L of water was put in a vessel, and 1 vol % of 2-propanol was further added thereto for accelerating the reduction reaction of silver ions.

[0082]A commercially available cotton cloth (with a size of 50 cm×50 cm) was immersed in the resultant aqueous solution, and the vessel was sealed and irradiated with cobalt-60 γ rays at each absorbed dose shown in Table 3 by using the same cobalt-60 γ irradiation equipment as in Example 1. It is noted that the aqueous solution was not stirred during the irradiation. Thereafter, the cotton cloth was taken out of the vessel, washed with water and dried to obtain a sample of each of Examples 6 through 10 having silver nanoparticles adhered to the sur...

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Abstract

Disclosed are a method for the antimicrobial treatment of a fiber and a process for the production of an antimicrobial fiber, each of which is characterized by immersing the fiber in an aqueous solution containing a noble metal ion or a noble metal complex and irradiating the aqueous solution with γ-ray or electron beam. In the method for the antimicrobial treatment of a fiber and the process for the production of an antimicrobial fiber, the noble metal constituting the noble metal ion or the noble metal complex is at least one noble metal selected from the group consisting of gold, silver, platinum, palladium, ruthenium, rhodium, iridium and rhenium. Also disclosed is an antimicrobial fiber produced by the process.

Description

TECHNICAL FIELD[0001]The present invention relates to an antibacterial treatment method for fiber, a method for producing antibacterial fiber and antibacterial fiber. More particularly, it relates to an antibacterial treatment method for fiber in which antibacterial metal particulates are firmly adhered to the fiber, a method for producing antibacterial fiber and an antibacterial fiber produced by the production method.BACKGROUND ART[0002]Harm caused by resistant bacteria such as MRSA derived from frequent use of antibiotics is recently becoming a problem, and new merits have been discovered in inorganic bactericides and antibacterial agents. This is principally because a metal such as silver or a metal oxide such as titanium oxide does not always exhibit a strong bactericidal function but is harmless to the human body without producing resistant bacteria and exhibits continuous antibacterial / antimold function against a wide range of bacteria and mold.[0003]Antibacterial agents usin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C18/14
CPCA61L2/238D06M10/008D06M23/08D06M11/49D06M11/83D06M11/42
Inventor SEINO, SATOSHIIDE, MASATOUEDA, HIROYUKIJUJIIE, KADUMASAKADOBAYASHI, ATSUSHI
Owner OSAKA UNIV
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