JPH07257938A - Soluble glass composition having anti-bacterial activity - Google Patents

Abstract

PURPOSE:To obtain a soluble glass composition containing zinc, which shows anti-bacterial activity, is impregnated or stuck to resin, fiber, paper or the like, and having anti-bacterial activity by blending ZnO, B2O3 and Na2O with limited components. CONSTITUTION:The soluble glass composition is composed of 15-50% ZnO, 40-80% B2O3 and 5-30% Na2O by mol%. Furthermore, the soluble glass preferably contains 5-30% Na2O+K2O (K2O is <=20%), <=20% at least one or more kind of CaO and MgO, <=20% SiO3 and <=20% Al2O3 and is capable of showing excellent anti-bacterial activity for a long period by having the composition. The soluble glass is used widely for towels, sport goods, filters for air conditioner, daily needs, brushes, tooth brushes or the like by kneading into a base material such as a resin or a fiber. In either case, since zinc ion is slowly eluted from the powder of the soluble glass kneaded into the fiber at a certain rate at the time of being in contact with water, excellent anti-bacterial function is shown.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soluble glass composition having antibacterial properties, which is made of boric acid glass containing zinc which is impregnated or attached to materials such as resins, fibers and papers and exhibits an excellent antibacterial effect. It is a thing.

[0002]

2. Description of the Related Art It has been attempted in the past to impart antibacterial, antifungal, deodorant and other functions to a material (hereinafter simply referred to as antibacterial property). For example, an inorganic material may be used for a material such as resin, fiber or paper. It is already known that the antibacterial agent is kneaded. And
As an inorganic antibacterial agent of this kind, a zeolite in which copper ions or silver ions are exchanged is known, but a material such as a resin in which the zeolite particles are kneaded has a small antibacterial function, and the elution rate is controlled. However, there are drawbacks such as difficulty, and high hygroscopicity of the zeolite particles themselves and poor processability and storability.

Therefore, the applicant of the present invention has developed a soluble glass containing silver ions as a novel soluble glass composition which solves the above-mentioned drawbacks, and previously disclosed Japanese Patent Application No. 1-2634.
No. 53 (Japanese Patent Publication No. 4-74453). However, although materials such as resins in which soluble glass containing silver ions is kneaded exhibit excellent antibacterial functions, silver ions are reduced due to the effects of heat during kneading into the resin and the effects of water or ultraviolet rays. This caused a phenomenon in which it was colored black. As a result, it becomes unsuitable for white clothing and sanitary goods in terms of appearance, and there is a problem that the use of the material is significantly limited.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and can exert an excellent antibacterial function in a stable manner for a long period of time, and also has excellent processability and storability. Completed with the object of providing a soluble glass composition that is excellent and has antibacterial properties that can be applied to materials for all purposes without causing color change under any manufacturing or use conditions. Is.

[0005]

DISCLOSURE OF THE INVENTION The soluble glass composition having antibacterial properties of the present invention, which has been made to solve the above problems, has a molar ratio of ZnO of 15 to 50% and B ₂ O _{3 of} 40 to 40%. 80
%, Na ₂ O: 5 to 30%.

The meltable glass used in the present invention means the physical properties of the glass such that it has a controlled melting rate.
It is a generic term for glass whose composition has been adjusted in consideration of chemical properties.Soluble glass containing zinc ions can elute zinc ions at a fixed rate over an arbitrary period of several hours to several years. . The eluted zinc ions can be adsorbed on the cell walls of bacteria or microorganisms or condensed in the cell membrane to inhibit the growth of bacteria or microorganisms by a so-called oligodynamic effect and exert an antibacterial function.

In order to elute zinc ions at a predetermined rate as described above, the soluble glass is ZnO in mol%.
_{: 15~50%, B 2 O 3} : 40~80%, Na 2 O: 5~3
It must be made up of 0%. Where ZnO
The range of 15 to 50 mol% is sufficient because when it is less than 15 mol%, in the case of zinc, unlike monovalent silver ions, it is an intermediate oxide that becomes a network-forming ion in the glass and its elution rate is extremely slow. ZnO to exert its antibacterial function
It is necessary to add 15 mol% or more as
On the other hand, when it is more than 50 mol%, the solubility is deteriorated and it is difficult to obtain a homogeneous glass. Also,
B ₂ O ₃ and was in the range of 40 to 80 mol%, 40 mol%
When it is less than, it becomes difficult to exert a sufficient action as a flux and it becomes difficult to form a sufficient glass skeleton,
On the other hand, when it is more than 80 mol%, the content of ZnO is relatively small, less than 15 mol%, and sufficient antibacterial properties cannot be exhibited. Also, Na ₂ O is added to 5 to 3
The range of 0% is that when it is less than 5 mol%, clear glass cannot be obtained and becomes opalescent glass, and due to this opacification phenomenon, the glass becomes inhomogeneous and stable antibacterial property cannot be exhibited. When it is more than 30 mol%, devitrification occurs during glass forming and the properties of the obtained glass become unstable.

Further, the soluble glass is Na ₂ O + in mol%.
K ₂ O of 5~30% (K ₂ O is less 20%), CaO and Mg
It is preferable that at least one kind of O ₂ is contained in 20% or less, SiO ₂ is contained in 20% or less, and Al ₂ O ₃ is contained in 20% or less. You can exercise your sexuality.

Such a soluble glass is preferably a powder having a particle size of 10 μm or less, and is used for molding a material having an antibacterial property, for example, by kneading or adhering it into a resin fiber material. Here, the particle size of the soluble glass is set to 10 μm or less in order to exert a sufficient antibacterial function by increasing the specific surface area because the elution rate of zinc ions is slow as described above. The addition amount of is preferably about 10 to 30% by weight of the material. As a result, the initial dissolution rate of zinc ions is controlled to 2 μg / g / day or more, and the product molded from this material exhibits a sufficient antibacterial function.

The fusible glass of the present invention as described above is kneaded into a material such as resin fiber and is widely used for clothes, towels, sports equipment, air conditioner filters, daily sundries brushes, toothbrushes and the like. However, in any case, when exposed to water, zinc ions are gradually eluted from the soluble glass powder kneaded into the fiber at a constant rate, and an excellent antibacterial function is exhibited. Moreover, unlike conventional silver ions, it is not reduced or colored by heat or ultraviolet rays.
Therefore, the product made of the material to which the fusible glass of the present invention is applied is not only hygienic due to antibacterial, antifungal and deodorant effects, but also well-matched with modern customs that emphasize cleanliness. In addition, there is no color change and it can be used for all products.

[0011]

EXAMPLE 1 A raw material formulation having the composition shown in Table 1 was used.
After glass was formed by melting at 000 to 1300 ° C, the obtained glass was crushed to 500 ± 90 µm, immersed in water at 20 ° C for 6 hours, and the solubility in water was measured by the weight reduction rate per hour.

[0012]

[Table 1]

The glass of Example 1 was wet pulverized by a ball mill to obtain a sample having a particle size of 10 μm or less, and the minimum inhibitory concentration against various bacteria was determined based on the following test method. A. Enrichment medium Mueller-Hinton liquid medium B. Susceptibility measurement medium Mueller-Hinton agar medium The sensitivity measurement medium was prepared using sterile purified water.
Prepare 64,000 μg suspension, and further dilute 2 times to obtain 2
After preparing and suspending a double dilution series suspension, each dilution series suspension was applied to a sensitivity measurement medium at 50 to 60 ° C.
The amount was added, and the mixture was sufficiently mixed, dispensed into a petri dish, and solidified to obtain a plate for measuring sensitivity. C. Preparation of bacterial solution for inoculation A bacterial solution of a test strain that had been cultured overnight at 35 ° C. in an enriched medium was diluted with the same medium and adjusted so that the number of bacteria was 10 ⁶ per ml. D. Cultivation Inoculate the bacterial solution on a susceptibility measuring plate with a nichrome wire loop (inner diameter of about 1 mm) for about 2 cm, and stir at 35 ° C for 18-20.
Incubated for hours. E. Judgment After the elapse of a predetermined time, the lowest concentration at which the growth was inhibited was defined as the minimum inhibitory concentration of the sample against various bacteria, and the obtained results are shown in Table 2.

[0014]

[Table 2] (Unit is μg / ml)

Further, in the same manner as described above, Embodiments 2, 6 to 9
Table 3 shows the results of examining the minimum inhibitory concentration against Staphylococcus aureus for the glass of No.

[0016]

[Table 3]

[0017]

As is clear from the above description, the soluble glass containing zinc ions of the present invention does not change color under any manufacturing conditions or use conditions, and is applicable to all uses. Moreover, it is possible to exert a stable antibacterial function for a long time.
Therefore, the present invention, as a soluble glass composition having antibacterial properties that eliminates the conventional problems, has a great contribution to the industrial development.

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Claims (2)

[Claims] 1. ZnO: 15 to 50%, B ₂ O ₃ : 4 in mol%.
Dissolvable glass composition having antibacterial properties, characterized by comprising 0 to 80% and Na ₂ O: 5 to 30%. 2. The fusible glass of claim 1 comprises Na in mol%.
5O to 30% of ₂ O + K ₂ O (K ₂ O is 20% or less), 20% or less of at least one of CaO and MgO, and 20% of SiO ₂ .
%, Al ₂ O ₃ 20% or less, The soluble glass composition having antibacterial properties according to claim 1, characterized in that