JPH09278617A - Antimicrobial ceramic powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain safe antimicrobial ceramic powder ensuring antimicrobial effect, and easily blendable or dispersible in or coatable or printable in food packaging materials. SOLUTION: This antimicrobial ceramic powder is obtained by sintering a composition comprising 45-65wt.% of silicon oxide or silicon carbide, 20-30wt.% of alumina and 15-25wt.% of titanium dioxide. In this case, the respective particle sizes of the compositional components differ from one another and are 0.007-0.07μm. The particle size during sintering is up to 0.1μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial ceramic powder having high safety and excellent antibacterial property, and relates to an antibacterial ceramic powder extremely suitable for antibacterial food packaging.

[0002]

2. Description of the Related Art Foods, especially fresh foods and processed foods having a high water content, have bacteria and mold fungi mixed in food materials from the beginning during production, distribution, and consumption, or are adhering and mixed during processing and production. Alternatively, they fall into the product during distribution and propagate in a short period of time, causing decay and deterioration, and food poisoning accidents frequently occur in addition to such decay and deterioration.

By the way, many bactericides effective for a wide range of fungi have been known as antibacterial agents for sterilizing and killing bacteria and fungi, but they are not safe for use in food packaging materials. Its use is restricted due to fear. For this reason, in the current fresh foods, each piece is wrapped with a synthetic resin film material, or is wrapped with a synthetic resin container or a paper container, etc., and bacteria or fungi adhere to or fall from the distribution to the consumption. However, since the film material and container do not particularly retain antibacterial properties, fungi mixed from the beginning are propagated successively, causing decay and deterioration, and also the outer surface of these packaging materials. Fungi that adhere to or fall on the soil propagate in a short period of time and are extremely unsanitary.

Further, processed foods are packaged in a simple packaging bag made of a bottle container or a synthetic resin film material for distribution and consumption. However, these packaging materials do not have any particular antibacterial property and are processed foods. At present, synthetic preservatives are added to processed foods in order to prevent spoilage and deterioration, because they decay or deteriorate in a short time, but consumers have used synthetic preservatives due to the recent remarkable increase in health orientation. The antibacterial property of food packaging materials is still unsolved due to the tendency to avoid processed foods.

In view of the above situation, the inventors of the present invention have earnestly studied, and as a result, the water forming the bacterial bodies of bacteria and fungi or the water molecules of the environmental water essential for the fungi to reproduce are resonated and excited, whereby Physiological function is inhibited or reproduction is prevented, and by the resonance and excitation of titanium oxide and silver or copper together with the presence of manganese oxide and zinc oxide, creation of free active oxygen having strong bactericidal activity and oligodynamic action are also exerted. It has been clarified that when activated, it exhibits excellent antibacterial properties, and the content thereof has already been disclosed in Japanese Patent Application No. 7-274638.

Then, a film or a packaging container for food packaging material is prepared by mixing the invention of the prior application with a synthetic resin material, or the outer surface of a paper container formed by mixing with a paper material or a general base paper, Even when food packaging is carried out using a food packaging paper container coated or printed with the invention of the prior application, no elution or residue of heavy metals or harmful substances in terms of food safety is observed at all and certainly. Although antibacterial effects can be expected, the composition of such components still limits their use in food packaging.

[0007]

The present invention has been made as a result of further studies for solving the above problems, and it is safe to use bacteria and fungi by using composition ingredients that are harmless to food safety. It is an object of the present invention to provide an antibacterial ceramic powder which can surely be antibacterial and can be easily blended and dispersed in a material for forming a food packaging material or can be applied or printed.

[0008]

Means for Solving the Problems The technical means adopted by the present invention for solving the above-mentioned problems are essential for the water forming bacteria such as bacteria and fungi, or when the fungi propagate. To effectively and efficiently resonate and excite water molecules of environmental moisture, active oxygen is generated from Otsu water molecules, and in order to ensure the antibacterial action of fungi with this active oxygen, wavelengths 1 to 1 in the resonance electromagnetic wave region of water molecules In order to effectively radiate near-infrared electromagnetic wave of 3 μm and far-infrared electromagnetic wave of wavelength 6 to 11 μm and maintain high safety, the particle size of the composition component is 0.00
7 to 0.07 μm, each having a different grain size, and sintered at a composition ratio of 45 to 65% by weight of silicon oxide, 20 to 30% by weight of alumina oxide and 15 to 25% by weight of titanium oxide to obtain the closest packing density. The ceramic is used to stably radiate the electromagnetic wave in the required region, and the stable electromagnetic wave is efficiently radiated, and is easily mixed and dispersed in the forming material such as the food packaging material or firmly applied to the food packaging material. The composition of the antibacterial ceramic powder consists of sintered ceramics with a particle size of 0.1 μm or less so that it can be worn or printed. Furthermore, it is effective in emitting near-infrared electromagnetic waves. In order to further increase the production of oxygen,
Instead of silicon oxide, silicon carbide is a constituent component.

[0009]

[Operation] The technical means of the present invention has the following actions. That is, the grain size of the composition component is 0.007 to 0.07 μm.
The particle size of the fine particles is different from that of ultrafine particles, and the composition component particles are mutually sintered because the composition ratio of silicon oxide is 45 to 65% by weight, alumina oxide is 20 to 30% by weight, and titanium oxide is 15 to 25% by weight. It is formed in a state of so-called closest packing density with strong binding force, and a predetermined electromagnetic wave is stably radiated.
Further, since the composition contains 45 to 65% by weight of silicon oxide, electromagnetic waves in the far infrared region of about 3 to 20 μm are emitted due to the radiation characteristics of the silicon oxide, and 20 to 30% of alumina oxide is emitted. Since a metal oxide having a weight ratio of 15 to 25% by weight of titanium oxide is composed, the metal oxide is moved to an electromagnetic wave region of a short wavelength.
Electromagnetic waves in the near infrared region of 9 to 2.5 μm are also emitted. If silicon carbide is used instead of silicon oxide, electromagnetic waves in the near-infrared region of a shorter wavelength of about 0.8 to 2.5 μm are emitted.

In addition, since the ceramics sintered and formed with such a composition are formed into fine particles having a maximum particle size of 0.1 μm or less, the radiative surface area ratio becomes extremely large, and electromagnetic waves in the near infrared and far infrared regions are generated. Is efficiently radiated.

Then, as a result of effective and efficient emission of electromagnetic waves in the near-infrared and far-infrared regions corresponding to the resonance wavelength of the water molecule of water molecules of the water content of the bacteria and the environmental water which is essential for the fungus to reproduce, the water molecules Is strongly resonated and excited to convert oxygen in the ground state of the water molecule into singlet oxygen, superoxide or hydrogen peroxide having high reactivity and bactericidal activity, or so-called activity such as hydroxyl radical from water molecule. Oxygen is produced.

Further, according to the present invention, the composition is made of an inorganic material, and titanium oxide is used in a proportion of 15 to 25% by weight, and the particle size is 0.1 μm or less at the maximum. Not only can it be easily mixed when compounded into a synthetic resin material that is a material, but titanium oxide has a dispersive action, so homogeneous compounding and dispersion can be achieved, and silicon oxide and silicon carbide, which are composition components, can be used as a synthetic resin adhesive. Because of its adherence property, it is possible to easily coat or print a food packaging material made of a synthetic resin material or a paper material on the outer surface.

[0013]

EXAMPLES Examples of the present invention will be described in detail below. As composition components used in the present invention, water forming bacteria of fungi and fungi and water of environmental water essential for reproduction of the fungi are used. Effectively and efficiently radiating near-infrared electromagnetic waves having a wavelength of 1 to 3 μm and far-infrared electromagnetic waves having a wavelength of 6 to 11 μm in order to resonate and excite molecules, and in addition to use in food packaging materials, coating or coating. Therefore, food with high food safety is required.

On the other hand, ceramics containing zirconia, titania, or alumina as a main constituent component have been known for a long time as a radiator that effectively radiates electromagnetic waves in the infrared or far infrared region. Therefore, silicon oxide, alumina oxide, and titanium oxide are selected as composition components for utilizing the electromagnetic radiation characteristics of ceramics and achieving the object of the present invention, and silicon carbide is selected in place of silicon oxide.

In the infrared or far infrared radiation characteristics of conventional ceramics containing silicon oxide as the main component, the radiation wavelength is in the region of approximately 3 to 3.3 μm and approximately 5 to 9 inclusive.
There is a peak with a relatively high emissivity in the μm region, and in the emission characteristics of conventional ceramics containing alumina oxide as the main component, there is a gentle peak with a low emissivity in the region where the emission wavelength is approximately 4 to 6 μm. Depending on the composition, ceramics have different radiation characteristics of electromagnetic waves. What is more characteristic is that the use of ultrafine particles having a composition component particle diameter of 0.07 μm or less and different particle diameters makes it possible for the components to have a high cohesive strength, that is, a so-called maximum bond strength. It is formed to have a close packing density, shifts to the short wavelength side of the radiated electromagnetic wave region, and provides uniform and stable radiation.

The composition components selected there, such as silicon oxide, alumina oxide, titanium oxide, or silicon carbide, should be ultrafine particles having a particle size of 0.007 to 0.07 μm, and their composition. At this time, it is important to use those having different particle sizes, and the reason is that in order to form the closest packing density, the component particles having a particle size of about 1/10 of the maximum particle size related to the composition are required. About 30
This is because it is possible if the composition is made with a ratio of about 50% to 50%.

The composition ratio of the composition components thus obtained is such that the radiation wavelength is in the far infrared region having a radiation wavelength of 1 to 3 μm and that in the far infrared region having a radiation wavelength of 6 to 11 μm. 45% to 65% by weight of characteristic silicon oxide, and 20% to 30% by weight of alumina oxide having emission characteristics in the far infrared region of the electromagnetic wave region are used to further enhance the emission of electromagnetic waves in the near infrared region. From the top, titanium oxide is 15 to 25%
It is composed by weight.

The antibacterial ceramic powder of the present invention is formed by sintering with such a composition ratio, and the electromagnetic radiation energy in the near infrared or far infrared region from the antibacterial ceramic powder. Since it corresponds to the actual temperature difference from the absolute temperature and is weak, it is important to increase the radiative surface area ratio in order to improve the radiation efficiency. For this purpose, the antibacterial ceramic powder formed by sintering is required. The maximum particle size is 0.1 μm or less.

The radiation characteristics of the antibacterial ceramic powder of the present invention and the results of examining the antibacterial property by using the antibacterial ceramic powder for food packaging will be described below. To form the antibacterial ceramic powder, 53% by weight of silicon oxide having an average particle size of 0.03 μm and alumina oxide 3 having an average particle size of 0.06 μm are used.
Titanium oxide with a 1% weight and an average particle size of 0.007 μm 1
Sintered with a composition of 6% by weight, the average particle size is 0.09
The radiation characteristics of the ceramic powder A having a particle diameter of 5 μm and the ceramic powder B having an average particle diameter of 0.091 μm, which were obtained by sintering using silicon carbide having substantially the same particle diameter in place of silicon oxide, were obtained. It is as shown in Table 1.

[0020]

[Table 1]

As is clear from Table 1, the ceramic powder A has a relatively high emissivity and the radiated electromagnetic wave region is approximately 1.
It is understood that the radiation characteristics exhibiting two peaks from 2 μm to 11 μm are obtained. Further, although the emissivity of the ceramic powder B is relatively low, the radiated electromagnetic wave region has a gentle curve from approximately 0.9 μm to 11 μm. It is understood that they have different radiation characteristics.

0.01% by weight of the above-mentioned ceramics powder A with respect to the polyethylene film molding resin,
80% thick with 0.1% weight and 1.0% weight
Each of the antibacterial polyethylene films is formed, and using the antibacterial polyethylene film, the width is 10 cm and the length is 20 c.
An antibacterial test was carried out using a control bag prepared in the same manner as the polyethylene bag formed by mixing the ceramic powder A but not using the polyethylene powder.

The test bacteria used in the antibacterial test include Escherichia coli 3301 and Pseudomonas aeruginosa.
IFO 13275) and melicitin-resistant Staphylococcus aureus
IID 1677) in NB medium at 35 ° C. for 16 to 2
A culture solution of the test strain that had been shake-cultured for 0 hours was diluted with the same medium to a cell count of about 10 ⁶ / ml, and then diluted 1000 times with a sterile phosphate buffer solution to be used as a bacterial solution.

The test method was as follows: 1 ml of the bacterial solution was enclosed in the antibacterial packaging bag and the control packaging bag, and a part of the bacterial solution was removed after 3 hours, 6 hours, 12 hours and 24 hours at 35 ° C. Table 2 shows the results of taking out and measuring the viable cell count.

[0025]

[Table 2]

[0026]

The present invention is the resonance wavelength region of water molecules.
Since the electromagnetic waves over the two resonance regions of the near-infrared electromagnetic wave of 3 to 3 μm and the far-infrared electromagnetic wave of 6 to 11 μm are radiated stably and efficiently, the water molecules of the water forming the bacteria and the environmental water essential for the reproduction are formed. Are strongly resonated and excited to generate active oxygen with strong sterilization and fungicidal activity from water molecules.When used in food packaging, fungi that are mixed from the beginning are attached during distribution and consumption. Alternatively, falling fungi are antibacterial in a short time, and the electromagnetic waves are constantly radiated under all circumstances from production to consumption, so that the antibacterial action is maintained and foods are kept hygienic, and active oxygen is converted from water molecules. It is produced, has a short life, and has extremely high food safety. Further, in the present invention, since titanium oxide is composed in a proportion of 15 to 25% by weight, even when used in a synthetic resin material, the titanium oxide exhibits dispersibility and can be uniformly dispersed. Silicon or silicon carbide is also composed in a proportion of 45 to 65% by weight, and since silicon oxide and silicon carbide have adherence to synthetic resin adhesives, they have many features such as being able to be applied or printed on food packaging materials. Antibacterial ceramic powder.

Claims (2)

[Claims] 1. The particle size of the composition component is 0.007 to 0.0.
The particle size is 7 μm, and the particle size is different, and silicon oxide is sintered at a composition ratio of 45 to 65% by weight, alumina oxide 20 to 30% by weight, and titanium oxide 15 to 25% by weight. An antibacterial ceramic powder characterized by being formed to a thickness of 0.1 μm or less. 2. The silicon oxide comprises silicon carbide.
The described antibacterial ceramic powder.