JP2000327364A - Antibacterial glass composition - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a dissolvable glass having a high dissolution rate and a high antibacterial activity, and having low hygroscopicity during storage and handling. A first feature is that the glass is a phosphate glass composition having a high solubility of water in water of 1% / Hr or more and containing 0.1% or more of Ag ions.
g ₂ O, 40 to 60% of P ₂ O ₅ in terms of mol%,
Na ₂ O and 40-50%, 0-10% of MgO, Al ₂
O ₃ hints _{0~2%, P 2 O 5 /} Na 2 O is 0.8
A second feature is that the glass is an antibacterial glass having a glass composition of 1.2 and containing 0.1 to 8% by weight of Ag ₂ O in the glass.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissolving glass made of a phosphoric acid-based glass containing Ag ions, which exhibits excellent antibacterial action when kneaded, impregnated or impregnated into materials such as resin, fiber and paper. It relates to a composition.

[0002]

2. Description of the Related Art Antibacterial glass containing Ag ions is:
Boric acid-alkali glass, boric acid-alkali earth glass or phosphoric acid-alkali earth glass has been proposed. By adjusting the composition of these dissolvable glasses, it is possible to dissolve them at a constant rate over an arbitrary period of several hours to several years, and the type of glass can be selected depending on the purpose of use.

However, when imparting antibacterial properties by impregnating or impregnating fibers, paper, etc., the melting glass to be used may require a relatively high melting rate. Conventionally used boric acid-alkali glass is 40% /
Although there is a dissolution rate of Hr, the solubility of Ag ions is 1.0
%, And it was difficult to impart antibacterial activity with a low concentration of glass.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and is a dissolving glass having a high dissolving speed and a high antibacterial activity, which has low hygroscopicity during storage and handling. To provide a functional glass.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a glass having a water solubility of 1% / H.
The first feature is that the phosphate glass composition is as fast as r or more and contains 0.1% or more Ag ions.
Further, Ag ₂ O is contained, and P ₂ O ₅ is 40 to
60%, 40-50% and Na ₂ O, and MgO 0
%, 0 to 2% of Al ₂ O _3, and a glass composition of P ₂ O ₅ / Na ₂ O of 0.8 to 1.2, and 0.1 to 8% of Ag in glass by weight%. _{A second} feature is that it is an antibacterial glass containing 2O.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail.
Will be described. The antibacterial glass of the present invention is a
Solubility is as fast as 1% / Hr or more and A is 0.1% or more.
It is a phosphate glass composition containing g ions. Further
Ag₂O and P₂O₅40 to 60
%, Na₂40 to 50% of O, 0 to 10% of MgO, A
l₂O₃Containing 0 to 2%, and P₂O₅/ Na₂O is 0.8
Consists of a glass composition of ~ 1.2, expressed in% by weight in the glass
0.1 ~ 8% Ag ₂It contains O.

Here, the reasons for limiting the glass composition will be explained. If P ₂ O ₅ is excessive, the glass has a high hygroscopicity, and it is difficult to handle such as pulverization. Conversely, if P ₂ O ₅ is too small, vitrification becomes difficult. 40% to 60% is preferred. When Na ₂ O is excessive, the phosphate glass structure is broken, the deliquescence is increased, and it is not practical. Conversely,
If the amount is too small, unmelted material tends to precipitate when the glass is melted.
0% to 50% is preferred. Further, P ₂ O ₅ / Na ₂ O
If the ratio is excessively large, the structure of the glass becomes unstable, the hygroscopicity becomes large, and the workability such as crushing deteriorates. Conversely, if the amount is too small, the hygroscopicity of the finished glass becomes large, which also deteriorates the workability, and 0.8 to 1.2 is preferable. When MgO is excessive, when it is made into glass powder, the dissolution rate of water becomes unnecessarily slow, and it is not suitable for the purpose of use. MgO may be omitted, but is a necessary component for controlling the water dissolution rate, and is preferably 0 to 10%. When a small amount of other alkaline earth metals, such as CaO and ZnO, is added, the effect of improving the water resistance of the phosphate glass becomes remarkable, and it is difficult to control the dissolution rate. Also, Al ₂ O
_{For the three} components, this tendency is more remarkable, at most up to 2%, and may not be present. On the other hand, the SiO ₂ component is not necessarily required because it has no effect of addition. Further, Ag ₂ O is an important component for imparting antibacterial properties to the glass of the present invention, and can be added and dissolved up to 8% by weight with respect to the original glass. Produces an undissolved precipitate at the bottom. If it is less than 0.1%, the antibacterial effect cannot be exhibited.

[0008]

EXAMPLES (Example 1) Sodium dihydrogen pyrophosphate, magnesium metaphosphate, aluminum phosphate, and silver nitrate were blended in the ratios shown in Table 1, and a clay pot was used.
Melting was performed in an electric furnace at 800 to 1200 ° C. Each glass had low viscosity, and fluidity was observed within 1 hour after heating. The molten glass was taken out of the electric furnace, poured out onto a carbon plate, formed into a cracked glass disk, and allowed to cool as it was. In the hygroscopicity test, this rice cracker-shaped glass disk was pulverized, and the powder classified to a particle size of 425 to 600 μm was taken out, left in the air for 24 hours, and the degree of coagulation of the glass powder was examined by touch. The results are shown in Table 1. The dissolution rate in water is about 1 g of powder classified to a particle size of 425 to 600 μm in 100 ml of distilled water.
It was calculated from the weight loss rate after leaving at 2 ° C. for 2 hours. The results are also shown in Table 1. Next, the antibacterial activity test is performed by dispersing 1% of the powder classified to 10 μm or less in distilled water, spraying and drying to a degree that the powder is moistened on 100% cotton cloth, and performing the test in accordance with the unified test method set by the Evaluation Committee for New Functions of Textile Products. Was. Table 1 shows the results.
It was shown to. The bactericidal activity value L shown in Table 1 is represented by the following equation. L = Ma-Mc where L: bactericidal activity value Ma: viable cell count immediately after inoculation of the unprocessed sample (average of 3 samples)
Mc: Common logarithmic value of viable cell count (average of 3 samples) of 18-hour culture solution of processed sample

[0009]

As shown in Table 1, although the glass of the present invention does not show hygroscopicity, it has a high solubility in water of 1% / Hr or more, a bactericidal activity value of 3 or more, and is excellent in antibacterial properties. It turns out that it is glass. On the other hand, in Comparative Example 1, Al ₂ O ₃
The addition amount is 5 mol%, and the dissolution rate is slightly slow at 1% / Hr, which does not meet the purpose of the present application. Comparative Example 2 is P ₂ O ₅ / N
This is an example of a composition having an a ₂ O ratio of 1.7, and has low hygroscopicity, making it difficult to handle and store.

[0011]

As described above, the use of the antibacterial glass of the present invention has solved the conventional problems and has a high melting rate.
The present invention can provide an antibacterial glass which is a soluble glass having a high antibacterial activity and has a low hygroscopic property during storage and handling.

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Claims (2)

[Claims] 1. A phosphate glass composition having a high solubility of water in water of 1% / Hr or more and containing 0.1% or more of Ag ions. _{2. It} contains Ag ₂ O, 40 to 60% of P ₂ O ₅ , 40 to 50% of Na ₂ O, and 0 to 0 of MgO in terms of mol%.
10%, containing 0 to 2% of Al ₂ O ₃ , P ₂ O ₅ / Na _2
2. The antibacterial glass composition according to claim 1, wherein O has a glass composition of 0.8 to 1.2, and contains 0.1 to 8% by weight of Ag2O in the glass.