KR100255111B1 - Anti-bacterial ceramic composition maintaining freshment and the manufacture method thereof - Google Patents

Abstract

PURPOSE: An antibacterial ceramics composition is provided, which has an excellent function for keeping freshness of foods. And a method for preparing the same is also provided. CONSTITUTION: The antibacterial ceramics composition comprises: (i) 8-20 wt.% of manganese oxide; (ii) 40-65 wt.% of ferric oxide; (iii) 10-20 wt.% of zinc oxide; (iv) 5-15 wt.% of magnesium oxide; (v) 0.3-5 wt.% of aluminum oxide; (vi) 0.5-5 wt.% of silicon dioxide; and (vii) not more than 2 wt.% of the others. The method comprises steps of: (i) dipping the antibacterial composition in an aqueous solution containing at least one of 0.3-10 wt.% of silver, 1-15 wt.% of copper and 1-20 wt.% of zinc for 24 hours; (ii) firing the composition of the step (i) at a temperature of 350 deg.C for 4 hours.

Description

Freshness-maintaining antibacterial ceramic composition and its manufacturing method

The present invention relates to a composition of a freshness-retaining antimicrobial ceramic having excellent performance in maintaining the freshness of foods and a method of manufacturing the same.

In general, ceramics have properties such as far-infrared radiators, heat accumulators, heating elements, and electromagnetic wave absorbers, and have various applications using these characteristics. Ceramics are capable of absorbing electromagnetic waves in almost all areas, from short wavelengths to long wavelengths, and they also emit absorbed energy in the form of thermal energy. Since the heat energy emitted is in the wavelength range of the far-infrared region, there are research reports that these ceramics promote plant growth, and some of them are utilized as bioactive ceramics. However, not all ceramics give the same activity to living organisms, and ceramics having excellent physiological activity can be said to be ceramics having excellent radiation characteristics while emitting a favorite wavelength of animal or plant cells.

Ceramics, which are used as conventional bioactive functions, are multipurpose ceramics developed for the purpose of improving most far-infrared radiation characteristics, and it is unclear whether they are most suitable for actually increasing the activity of living organisms. In addition, since the composition and manufacturing method of the ceramics being used do not have a definite characteristic, the effect thereof is not surely guaranteed. For this reason, the use of ceramics in this area has not increased significantly.

On the other hand, the value added of the product is being increased by using paints to which antimicrobial ceramics are added, such as recently developed home appliances. However, although the ceramics used here are very expensive, they are dependent on the far-infrared radiation capability of the ceramics themselves, or on the contrary, most ceramics have only antibacterial ability and little or no physiological activity. Current antimicrobial ceramics mainly include zeolite, calcium phosphate, titanium, glass, and zirconium phosphate. They usually contain 1 to 3% by weight of silver, zinc or other metals (40% by weight of zeolite). It is possible to have an antimicrobial amount. However, these are basically aimed at only antibacterial ability, and the ability for this is sufficient, but the bioactivity of the base material is not very low or can not be expected bioactivity. In addition, in order to increase the antimicrobial activity, the concentration of the antimicrobial material must be increased, and it has an expensive disadvantage.

The present inventors have invented the ceramics marketed as excellent in the growth and activity of the organism described above, and new freshness-maintaining ceramics that solve the problems of antimicrobial ceramics and satisfy both characteristics at the same time through theoretical examination and test.

SUMMARY OF THE INVENTION An object of the present invention is to provide a freshness-maintaining ceramic composition and a method for producing the same, which can dramatically improve the freshness of food or agricultural products by promoting the growth of living organisms and at the same time giving them antimicrobial ability by having the best spinning properties for living organisms. .

Another object of the present invention is to provide a cheaper price than the current antimicrobial ceramics by facilitating the production of such high functional ceramics.

Another object of the present invention is to use a material that can be applied to industrial products such as antimicrobial fiber, antimicrobial container, antibacterial construction as well as use as a film filler, packaging container filler for maintaining freshness of agricultural and livestock products by using the efficacy of the ceramics. To provide.

Anyone can think of using the physiological activity of ceramics, but it is very difficult to increase the physiological activity to be effective effectively. Through various theoretical approaches and tests, the inventors have optimized the composition of ceramics so that they work best on the cells of living organisms, and the far-infrared radiation is extremely high, which greatly enhances the physiological activity and greatly improves the maintenance of freshness. By adding antimicrobial ability directly to the composition of the ceramics, the present invention invented desirable freshness-retaining antimicrobial ceramics.

In order to achieve the above object, the present inventors obtained a ceramic composition having the highest physiological activity by mixing metal oxides of natural minerals. As mentioned earlier, evidence has shown evidence that ceramics' far-infrared radiation can promote the growth of living things. However, not all ceramics have the same activity, so it is not easy to ensure the maintenance of freshness by promoting physiological activity by using ceramics. The inventors have found through testing that the material of ceramics is most effective in promoting the growth of organisms when certain metal oxides have a certain mixing ratio.

Commonly used ceramics are all made of various materials. When these various ceramics are mixed, they do not have effective activity. In addition, since absorption, radioactivity, wavelength, etc. of each component are different, the activity expected by the use of general ceramics cannot be obtained. The present inventors found that ceramics based on the following composition showed the best physiological activity among these various ceramic components.

1. More than 70% by weight of the oxide of the d-transition element in the total metal oxide

2. The oxide of main group element is 30 wt% or less

3. The d-transition element metal oxide contains at least three or more, three of which are characterized in that each has a composition of more than 5% by weight to less than 70% by weight.

In more detail, ferric oxide (Fe ₂ O ₃ ), manganese oxide (MnO ₂ ), silver oxide (Ag ₂ O), chromium oxide (Cr ₂ O ₃ ), copper oxide (CuO), hafnium oxide (HfO ₂ ), Nickel oxide (NiO), ruthenium oxide (RuO ₂ ), titanium oxide (TiO ₂ ), vanadium trioxide (V ₂ O ₃ ), zinc oxide (ZnO), zirconium oxide (ZrO ₃ ), molybdenum oxide (MoO ₃ ), oxide More than 70% by weight of d-transition element oxides such as niobium (NbO) and yttrium oxide (Y ₂ O ₃ ), including at least three or more elements, and three elements more than 5% by weight or more 70 It should have a composition of up to weight percent. More specifically, in terms of performance and price, that is, natural minerals that can be easily obtained and used in nature, more specifically, 8 to 20% by weight of manganese oxide, 40 to 65% by weight of ferric oxide, and 10 to 10% of zinc oxide. 20 wt%, and other metal oxides of 1 wt% or less may be contained in a small amount.

Oxides of main group elements include aluminum oxide (Al ₂ O ₃ ), barium oxide (BaO), calcium oxide (CaO), gallium oxide (Ga ₂ O ₃ ), indium oxide (In ₂ O ₃ ), potassium oxide (K ₂ O), magnesium (MgO), oxidation of (P ₂ O _3), lead oxide (PbO), oxide, rubidium (Rb ₂ O), silicon oxide (SiO _2), oxidation strontium, rhodium (SrO), etc. is used, the oxidation It is preferable to use them in an amount of 30% by weight or less in total. More preferably, in terms of efficacy and cost, 5 to 15% by weight of magnesium oxide, 0.3 to 5% by weight of aluminum oxide, 1 to 5% by weight of silicon oxide, and others of 1% by weight or less, and the entire main group element oxide is 10%. It is preferable to make it into 25 weight% or less.

There is no significant performance difference in the type or amount of the trace element or main group element oxide, but in the case of d-transition element oxide, there is a big difference in the number and type of elements contained. For this reason, it has been found that a mixture of at least three or more preferably five or more different metal oxides is most effective for biological activities, particularly vegetables and fruits.

These oxides can be obtained from natural minerals, so there may be a small amount of other minerals, but they can be used in combination if they are in the composition range and harmless to the human body. In this case, there is an advantage that the manufacturing cost can be lowered.

The ceramic composition of the composition is primarily made by grinding and mixing uniformly, dried and then calcined at a constant temperature for a predetermined time or more, which may be obtained by calcining at 1250 ° C. for 3 hours. Can be classified and used.

The ceramics prepared by the above composition have a very effective radiation property in view of the absorption wavelength of 6-10 μm of living organisms, especially fruits and vegetables, as well as excellent freshness retention. Judging.

The present invention is also known that the physiologically active ceramics are superior to any conventional ceramics, but the antimicrobial activity of silver, copper and zinc are known to be excellent in antimicrobial activity in view of the fact that it is not satisfactory because it possesses only the antimicrobial activity of its own metal oxide. The antimicrobial ability of the conventional antimicrobial ceramics is treated by treating the back and the like.

In more detail, the ceramics produced at the above weight ratio are more than a certain concentration of silver (0.3 to 10% by weight, preferably 1 to 3% by weight), copper (1 to 15% by weight, preferably 3 to 10% by weight). It is prepared by impregnating an aqueous solution such as zinc (1-20 wt%, preferably 3-15 wt%) for at least a predetermined time, and then firing at a predetermined temperature and time.

These antibacterial metal oxides can be used alone or simultaneously.

The ceramics thus prepared had the ability to promote plant growth of 30% or more, and the antibacterial activity of the ceramics treated with 2% silver nitrate solution showed the ability to kill the Sephacia bacteria within 5 hours at a concentration of 0.02 g / mL.

The present invention can be utilized in various ways to maintain the freshness of food or agricultural and livestock products, for example, the ceramics of the present invention can be directly used and stored, and can be directly used by molding and baking in the form of beads, blocks, legos, etc. In addition, it can be mixed with alumina and the like to maintain the strength and shape and fire it, and can be used for packing film packing, packing material packing or coating, electronic products, antibacterial fiber, antibacterial container, antibacterial building, antibacterial wall, antibacterial peg, antibacterial cosmetic, It can be used as a filler of paper, pulp, plastic, etc.

Hereinafter, the specific configuration and operation of the present invention will be described in detail according to the embodiment, but the embodiment of the present invention is only a basic example and does not limit the scope of the present invention even if any change thereof.

Example 1

The ceramics were prepared as shown in Table 1 by combining the raw materials of natural mineral components.

These materials were pulverized and mixed, wet mixed and pulverized again, and then a 70 mesh passage was calcined at 1250 ° C. for 3 hours. Compared with the ceramics thus prepared and no additives, the physiological activity was compared.

The physiological activity test was performed by adding 1 g of ceramics to the culture medium of 15 mL of water and germinating 20 radishes compared with the absence of ceramics. As a result, in the germination rate of germination, the germination rate of 100% was 90% at no addition, and the germination time was 28 to 32 hours, which was 30% faster. In addition, it was 24% higher than the previous index in comparison with the final weight divided by the initial weight.

Example 2

The ceramics prepared in Example 1 were impregnated with 2 wt% silver nitrate aqueous solution with a stirrer for 24 hours, dried, and then fired at 350 ° C. for 4 hours to prepare an antimicrobial ceramic. The antibacterial and physiological activities were tested using this antimicrobial ceramics.

The antibacterial test showed the ability to kill the Sephacia bacteria in the test medium with the antibacterial ceramics concentration of 0.02 g / mL in 5 hours, and the reduction rate of Sephacia bacteria was very fast at 4.5% per hour even at the concentration of 0.004 g / mL.

In the physiological activity test, 1 g of ceramics was added to a culture solution of 1.5 mL of water, and 20 radish germinated tests were compared with the absence of ceramics. This resulted in more than 35% growth in the comparison index of radish growth without the silver treatment.

Example 3

A low density polyethylene film containing 2% by weight of the antimicrobial ceramics of Example 2 was prepared at a thickness of 30 micrometers, and the freshness-retaining storage performance of the general polyethylene packaging film and the fruits and vegetables was compared.

The test method measured the freshness retention period after vacuum-packing the sample in each wrapping paper. The comparison results are shown in Table 2 below.

As shown in Table 2, it was found that the packaging film containing the freshness-maintaining antibacterial ceramics had a storage effect in the freshness index such as hardness and elasticity.

As described above, it is possible to effectively maintain the freshness of the food to be stored by increasing the physiological activity and adding antibacterial activity by the practice of the present invention.

Claims (4)

8-20 wt% manganese oxide, 40-65 wt% ferric oxide, 10-20 wt% zinc oxide, 5-15 wt% magnesium oxide, 0.3-5 wt% aluminum oxide, 0.5-5 wt% silicon oxide, other Freshness maintenance type antimicrobial ceramic composition, characterized in that less than 2% by weight. The freshness-maintaining antimicrobial ceramic composition according to claim 1, wherein the composition is used to prepare a polymer packaging film containing 1 to 5 wt%. After the impregnation of the composition of claim 2 in an aqueous solution containing 0.3 to 10% by weight, 1 to 15% by weight, or 1 to 20% by weight of zinc, alone or together, the composition is calcined at 350 ° C. for 4 hours. Freshness maintenance type antimicrobial ceramic composition manufacturing method. The method according to claim 3, wherein the composition prepared by the method for preparing the composition is used to prepare a polymer packaging film containing 1 to 5% by weight.