JPH09278441A - Antibacterial ceramic powder for food packing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain antibacterial ceramic powder capable of easy mixing with synthetic resin stock or paper stock forming a food packing material or capable of printing or sticking by coating by sintering SiC, Al2 O3 , ZnO and TiO2 in a specified ratio and imparting a prescribed particle diameter. SOLUTION: This antibacterial ceramic powder is obtd. by sintering 30-50wt.% SiC or SiO2 1A, 20-40wt.% Al2 O3 1B, 9-20wt.% ZnO 1C and 3-8wt.% TiO2 1D and imparting <=0.1μm particle diameter. Food packed using this ceramic powder can safely be kept antistatic over a long period of time. In this ceramic powder, SiC or SiO2 and Al2 O3 are ceramics radiating electromagnetic waves which resonate and excite molecules of water forming bacteria and environmental water necessary for the propagation of bacteria and convert the water into modified water in which bacteria cannot live and ZnO and TiO2 generate free active oxygen having high sterilizing power.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a synthetic resin material or a paper material forming a packaging container for fresh foods, processed foods or the like, so-called food packaging material, which is mixed with or printed or applied to make foods safe. The present invention also relates to an antibacterial ceramic powder for food packaging that retains antibacterial properties for a long period of time.

[0002]

2. Description of the Related Art Foods, especially perishable foods and processed foods with high moisture content, are mixed with bacteria and fungi from the beginning or are attached during processing and production during the period from production to distribution and consumption. They are mixed or mixed by dropping in the air, and they propagate in a short period of time, which causes decay and deterioration of foods.

[0003] Therefore, conventionally, fresh foods are packaged in a paper container, a synthetic resin container or the like to prevent adherence and contamination of fungi from the time of distribution to consumption. Alternatively, since it does not have a particular antibacterial property against falling fungi, a large amount of fungi propagate in the paper container and the synthetic resin container, which is extremely unsanitary. For this reason, it has been attempted to blend an antibacterial agent into a paper container or a synthetic resin container to antibacterialize these fungi, but when an antibacterial agent is used, the antibacterial effect is exerted by elution or volatilization of the antibacterial agent. Not only is it extremely dangerous from the standpoint of food safety, but there are also many problems such as the problem of antibacterial persistence.

For processed foods having a higher moisture content, so-called simple packaging using synthetic resin film material has been conventionally used. In such simple packaging, the synthetic resin film material should retain sufficient waterproofness and airproofness. Since there is a risk that packaged foods will be spoiled or deteriorated in a short period of time, synthetic preservatives are added to foods to prevent spoilage and deterioration, but consumption has been increasing due to a marked increase in health-oriented products in recent years. As people are avoiding foods containing these synthetic preservatives, effective antibacterial means have not been solved even in simple packaging.

The inventors of the present invention have long earnestly conducted research on antibacterial means for bacteria and fungi which substitute for antibacterial agents, and as a result, form bacteria and fungi by radiation of electromagnetic waves in a specific region of near infrared rays and far infrared rays. It was clarified that the physiological activity of the fungus is inhibited and the reproduction is inhibited by resonating and exciting the water in the fungus body and water molecules of environmental water essential for the fungus to reproduce. Generation of free active oxygen that retains antibacterial activity from titanium oxide by electromagnetic waves, that antibacterial activity can be achieved by oligodynamic action of silver or copper, and creation of these free active oxygen by mediating manganese oxide or zinc oxide It was clarified that the oligodynamic action was activated, and the contents thereof have already been disclosed in Japanese Patent Application No. 7-274638.

[0006]

However, in order to impart an antibacterial property to a packaging material for directly packaging foods, the prior invention cannot be used because of food safety restrictions. The present invention has been made in view of the above problems, and the present invention is capable of easily mixing or printing or coating on a synthetic resin material or a paper material forming a food packaging material, and safe foods to be packaged. Another object of the present invention is to provide an antibacterial ceramic powder for food packaging, which can retain the antibacterial property for a long period of time.

[0007]

The technical means adopted by the present invention to solve the above-mentioned problems restrict the use of manganese oxide, silver or copper in maintaining the safety of the packaged food. Therefore, water that forms bacterial cells of fungi and fungi and the water molecules of environmental water, which are essential for reproduction by the fungi, sufficiently resonate and excite water molecules, thereby inhibiting the physiological functions of the fungi and preventing their reproduction. The objective is to continuously create free active oxygen and to sterilize fungi etc. reliably and for a long time.

Therefore, ceramics is selected as a material for efficiently radiating electromagnetic waves of 1 to 3 μm and 6 to 11 μm, which are effective wavelengths for resonating and exciting water molecules, and silicon carbide or silicon oxide is selected as the composition. 30 to 50% by weight and alumina oxide 20 to 40
% By weight, and in order to effectively create free active oxygen by excitation, electromagnetic wave radiation with a wavelength of 1 μm or less in the near infrared or ultraviolet region and zinc oxide for continuously creating free active oxygen are 9%. To 8% by weight, and 3 to 8 titanium oxide that creates free active oxygen.
%, The maximum particle size is 01 in order to increase the radiation efficiency of electromagnetic waves and the creation efficiency of free active oxygen.
It exists in the structure formed by less than μm.

[0009]

The present invention using the technical means as described above has the following actions. That is, since the composition ratio of the metal oxide is large, the composition ratio of the metal oxide is 20% to 40% by weight of alumina oxide and 9% to 20% by weight of zinc oxide to 30 to 50% by weight of silicon carbide or silicon oxide. Wavelengths 1 to 3 μm and 6 to 1 for resonance and excitation of water molecules
Electromagnetic waves of 1 μm are radiated to resonate and excite water molecules that form bacteria and environmental water, which is essential for the growth of fungi, and in particular radiates electromagnetic waves with wavelengths of 1 to 3 μm to denature beyond the survival range of fungi. Turn into water in the state.

Then, with a large amount of metal oxide composition such as alumina oxide and zinc oxide, electromagnetic waves ranging from near infrared rays having a wavelength of 1 μm or less to ultraviolet region are also radiated, and titanium oxide resonates with zinc oxide. When excited, the titanium oxide creates free active oxygen even if it does not absorb electromagnetic waves in the external light, so-called external ultraviolet region. Moreover, the resonance and excitation of zinc oxide causes a redox action on titanium oxide that has created free active oxygen, so that free active oxygen is continuously created from titanium oxide.

Further, since the ceramics having such a composition are formed into ultrafine particles having a particle size of 0.1 μm or less, the surface area ratio is extremely large, and the emission of electromagnetic waves and the generation of free active oxygen are extremely efficiently performed. The present invention is ultrafine, has a high porosity, an apparent specific gravity of about 1.2 to 1.4, and is composed of an inorganic material and a metal oxide. It can be processed even under heating conditions during processing, and the inorganic material retains good adhesiveness even when printing or coating means is used.

[0012]

EXAMPLE An example of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an enlarged explanatory view of the present invention. The present invention provides an antibacterial ceramic powder that prevents spoilage or deterioration due to the attachment and reproduction of fungi and fungi, and its technical idea is to propagate water and fungi that form bacterial cells of fungi and fungi. It is necessary to resonate and excite water molecules of environmental moisture, which is essential for the modification, to denature it into water that inhibits the physiological functions of the fungus, and to continuously generate free active oxygen with high bactericidal activity. That is to ensure reliable antibacterial.

Thus, the absorption range of the so-called electromagnetic wave, which is the wavelength at which water molecules are resonantly excited, exists in the electromagnetic wave length of 1 to 3 μm, that is, the near infrared region, and the electromagnetic wave length of 6 to 11 μm, that is, the far infrared region, Ceramic materials have been known as electromagnetic wave radiators in the far infrared region, and titanium oxide can be excited and excited by absorption of electromagnetic waves in the ultraviolet region to create free active oxygen with excellent bactericidal activity. Are known.

Therefore, in the present invention, by utilizing the electromagnetic wave radiation characteristic of ceramics, the radiation wavelength range of the radiation wavelength is 3 μm as well as the far infrared radiation region.
In order to radiate a wide range of electromagnetic waves from m to m near infrared region to ultraviolet region, silicon carbide or silicon oxide 1
The composition is such that 20 to 40% by weight of alumina oxide 1B, which is a metal oxide, and 9 to 20% by weight of zinc oxide 1C, relative to 30 to 50% by weight of A.

Then, titanium oxide 1D for creating free active oxygen is further added to the composition in an amount of 3 to 8% by weight, and the powder is sintered into a powder having a particle size of 0.1 μm or less at the maximum. The antibacterial ceramic powder 1 is formed. In such a case, the silicon carbide or silicon oxide 1A, the alumina oxide 1B, the zinc oxide 1C, the titanium oxide 1D, etc. forming the antibacterial ceramic powder 1 are colloidal and extremely fine particles. Antibacterial ceramic powder 1 with strong binding force by binding
It is desirable to use those having different particle diameters in order to obtain the above. Specifically, those having a particle diameter of about 0.01 μm to about 0.06 μm are appropriately selected and mixed in a required ratio amount. Good. Further, when it is desired to emit electromagnetic waves in the near infrared or ultraviolet region, it is desirable to use silicon carbide instead of silicon oxide.

Titanium oxide 1 that creates free active oxygen
D is usually resonated and excited with absorption of light energy, that is, electromagnetic waves in the ultraviolet range to create free active oxygen, but in the process of being used as a food packaging material, electromagnetic waves in the ultraviolet range cannot be absorbed. There are many situations where free active oxygen is not created, or there is a problem that the free active oxygen creation effect is gradually lost as free active oxygen is created by absorption of electromagnetic waves in the ultraviolet region. .

With respect to such a problem, in the present invention, not only the far-infrared region but also the near-infrared region having a wavelength of 3 μm or less to the ultraviolet region is emitted as the region of the emitted electromagnetic wave. Titanium oxide 1D is resonated and excited by radiated electromagnetic waves to generate free active oxygen under any circumstances, and manganese oxide 1C is also resonated and excited by radiated electromagnetic waves to create free active oxygen. The redox action works with the titanium oxide 1D, and the creation of free active oxygen of the titanium oxide 1D is continued.

When the present invention having such a structure is used for a food packaging material, it depends on the particle size of the antibacterial ceramic powder 1 used, the nature of the food to be packaged, the material of the packaging material, and the like. As shown in FIG.
When the antibacterial ceramic powder 1 having a particle size of 08 μm is blended with the synthetic resin film material 2 for use, a blending ratio of about 0.1 to 30% by weight based on the weight of the synthetic resin film material 2 is sufficient. Antibacterial effect can be expected.

The antibacterial test results in the case of a simple packaging bag for pickles using a polyethylene film material will be described below. The antibacterial ceramic powder 1 having an average particle size of 0.073 μm is added to a polyethylene film grade resin in a weight ratio. A polyethylene film having a thickness of 80 μm was obtained by blending 03%, and a bag having a width of 10 cm and a length of 20 cm was formed into an antibacterial packaging bag, and the polyethylene film containing no antibacterial ceramic powder 1 was similarly formed. The one was used as a control packaging bag.

The test bacteria used for the antibacterial test are Escherichia coli (Es
cherichia coli 3301), Pseudomonas aeruginosa I
FO13275), and melicitin-resistant Staphylococcus aureus I
ID 1677) was shake-cultured in an NB medium at 35 ° C. for 16 to 20 hours, and the culture solution of the test strain was diluted with the same medium so that the number of cells was about 10 ⁶ / ml.
What was diluted to 00 times was 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 the mixture was stored under the condition of 35 ° C.
Table 1 shows the results of measuring the viable cell count by taking out a part of the bacterial solution after the lapse of time and after the lapse of 24 hours.

[0022]

[Table 1]

[0023]

As described above, the present invention has a particle size of 0.1.
The particle size is extremely fine (μm or less), and is composed of 20 to 40% by weight of alumina oxide, which is a metal oxide, and 9 to 20% by weight of zinc oxide, relative to 30 to 50% by weight of silicon carbide or silicon oxide. Therefore, a wide range of electromagnetic waves from the far infrared region to the ultraviolet region are radiated and absorbed in two wavelength bands of 1 to 3 μm and 6 to 11 μm, which are absorption wavelength bands of water, and are resonated and excited remarkably, which causes bacteria and mold fungi. Since the water forming the bacterial cells and the environmental water for reproduction are denatured beyond normal habitation, not only is sterilization significantly prevented by inhibiting physiological functions and reproduction, but even if fungi that survive the provisional dead remain. Titanium oxide, which creates free active oxygen with high bactericidal activity, is further composed in an amount of 3 to 8% by weight, and since electromagnetic waves that resonate and excite the titanium oxide are constantly radiated, free active oxygen is released. Oxygen be created at all times, the remaining fungus is reliably sterilized. In addition, the zinc oxide formed is also resonated and excited by electromagnetic waves, and as a result, the redox action with titanium oxide works, and the creation of free active oxygen is continued for a long time. Furthermore, since the present invention is antibacterial by the radiation of electromagnetic waves and the oxidative sterilizing power of free active oxygen, it never elutes or adheres to the packaged foods and remains,
In terms of food safety, it is completely harmless.

Since the present invention has a fine particle size of 0.1 μm and an apparent specific gravity of about 1.2 to 1.4, it is sufficiently mixed with various synthetic resin materials to form a packaging material. It can be dispersed and mixed in, and since silicon carbide or silicon oxide in the composition retains adhesiveness, it has an extremely large number of features such as imparting antibacterial property to the packaging material by printing or coating. It can be said that it is an antibacterial ceramic powder for food packaging.

[Brief description of drawings]

FIG. 1 is an enlarged explanatory view of the present invention.

FIG. 2 is a sketch of a synthetic resin film material using the present invention.

[Explanation of symbols]

 1 Antibacterial Ceramic Powder 1A Silicon Carbide or Silicon Oxide 1B Alumina Oxide 1C Zinc Oxide 1D Titanium Oxide 2 Synthetic Resin Film

Claims (1)

[Claims] 1. Alumina oxide having a particle size of 0.1 μm or less and 30 to 50% by weight of silicon carbide or silicon oxide.
Sintered in a composition ratio of 0 to 40% by weight, zinc oxide 9 to 20% by weight, and titanium oxide 3 to 8% by weight,
Antibacterial ceramic powder for food packaging.