JPH02239812A - Tableware having antiseptic and antifungi property - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to tableware having antiseptic and antifungal properties suitable for use as, for example, lunch boxes for school lunches.

(Prior art) It has long been known that metal ions such as silver and copper have antiseptic and antifungal properties. Paints containing ions are used. It is also known that using steel pipes for irrigation pipes can prevent the growth of bacteria and algae, and that woven thin copper wires into clothing can prevent the generation of bad odors caused by sweat and skin bacteria. However, there are not many well-known examples of using metal ion preservatives and anti-mold agents in tableware to prevent food spoilage and mold growth.

Therefore, the present inventors used porous zeolite that has adsorbed silver ions, which are said to have antiseptic and antifungal properties, and applied a paint mixed with this to the surface of tableware. An attempt was made to demonstrate its anti-mildew effect. However, since the antiseptic and anti-mold effects are not sufficient, a large amount of zeolite must be mixed into the paint, which not only makes it difficult to mix it evenly into the paint, but also causes the appearance after application to become matte. In addition to impairing the aesthetic appearance, zeolite also has problems such as being inconvenient to handle due to its strong hygroscopicity.

(Problems to be Solved by the Invention) The present invention can solve the above-mentioned conventional problems and exhibit stable antiseptic and anti-mold effects over a long period of time.
Moreover, it has been completed in order to provide tableware that is non-toxic, safe for the human body, and has antiseptic and anti-mold properties that have a good appearance after application.

(Means for Solving the Problems) The present invention aims to solve the above problems by adding fine particles of soluble glass that can gradually dissolve silver ions at a constant rate into tableware resin or tableware paint. It is characterized by being dispersed into Furthermore, in the present invention,
Silver ions from the surface of tableware? Dispensing speed is 0. OOO1～1
．． It is controlled to be 0 tt g/crIl/day.

As described above, in the present invention, a soluble glass capable of eluting silver ions at a constant rate is used as a preservative and anti-mold agent. Meltable glass is a general term for glasses whose composition has been adjusted in consideration of the physical and chemical properties of the glass so as to have a controlled melting rate, and is already known in itself. Therefore, in a soluble glass to which a silver compound has been added, silver ions can be eluted at a fixed rate over an arbitrary period of time ranging from several hours to several years. The eluted silver ions then adsorb to the cell walls of bacteria and microorganisms or concentrate within their cell membranes, inhibiting the growth of bacteria and microorganisms through a so-called oligodynamic effect, and exhibiting antiseptic and antifungal effects.

In the present invention, the soluble glass containing such silver ions has a particle size of 200 μW or less, preferably 50 μm.
Disperse in resin or paint as fine particles.

If the particle size exceeds 200 μm, the particles will not be uniformly dispersed in the resin or paint, resulting in poor mixability. In addition, if the amount of soluble glass mixed into the resin or paint is less than 0.05%, the effect of silver ions will be insufficient, and if it exceeds 15%, it will be difficult to mix into the resin or paint. Therefore, the mixing amount was set to about 0.05 to 15%.

In the present invention, as a material for tableware resin in which fine particles of meltable glass containing silver ions are dispersed and mixed, for example, A
BS resin, phenol resin, polycarbonate resin, polypropylene resin, melamine resin, etc. were used.

Further, as the developing agent for the tableware paint, for example, acrylic resin, urethane resin, polyester resin, vinyl resin, etc. were used. Generally, the resins and coatings for tableware made using these materials have a slight water permeability, so the soluble glass dispersed within the resin or coating may dissolve due to water or humidity. As a result, silver ions are gradually eluted onto the surface of the tableware, and as a result, the food stored in the tableware has a preservative and anti-mold effect.

As mentioned above, the elution rate of silver ions from the tableware surface was set to 0.0001 to 1.0 μg/cJ/day because the elution rate of silver ions was 0.00 μg/cl/day.
If it is less than y, a sufficient antiseptic and anti-mold effect cannot be obtained, and if it is more than 1.0 μg/cffl/day, more anti-inflammatory ions will be eluted than necessary, making it difficult to maintain the effect.

(Example) Example I 8203 50 mol%, SiO2 30 mol%, NazO
Fine particles of soluble glass with a particle size of 25 μm or less are prepared by adding 0.5 parts by weight of 8g20 to 100 parts by weight of glass having a composition of 20 mol%, and the fine particles are placed in polyester urethane resin. Two types of paints were prepared: 0.5% by weight and 5.0% by weight. After each of these two types of paint was applied to the surface of tableware molded from ABS resin, the amount of silver ions eluted and the sterilization effect were measured. The amount of silver ions eluted was determined by filling a dish with pure water and keeping it at 20°C for 24 hours, and then measuring the silver ion concentration in the water using an atomic absorption spectrophotometer.

Table 1 shows the results of measuring the amount of silver ions eluted over time. It can be seen that the volume is almost constant.

Furthermore, Table 2 shows the results of measuring the reduction rate of E. coli using the shake flask method, and it can be seen that E. coli was almost completely eradicated in the tableware using the two types of paints.

Table 1 Contamination rate 1st day 5th day 10th day 50th day 100th day Table 2 Contamination rate 1 hour 6 hours 48 hours Silver ion elution amount (unit μg/c1il/day) 0.5% by weight 0. 0010 0.0010 0.0005 0.0005 0.0004 5.0% by weight 0.009 0.008 0.008 0.005 0.004 Reduction rate of bacterial count (unit: 0%, no decrease, no decrease, no decrease) 0.5 weight% 80.5 99.5 or more 99.5 or more%) 5.0 weight% 99.5 or more 99.5 or more 99.5 or more Example 2 From the same meltable glass as Example 1 Three types of paints were prepared by preparing fine particles having a particle size of 15 μm or less and dispersing the fine particles in a polyurethane resin in an amount of 0.05% by weight, 2.5% by weight, and 5.0% by weight. After each of these three types of paint was applied to the surface of tableware molded from ABS resin, the amount of silver ions eluted was measured, and changes over time were observed when various food products were placed inside and left indoors. Table 3 shows the results of measuring the amount of silver ions eluted over time. In addition, the changes over time of foodstuffs are shown below in itemized form, with tableware coated only with polyurethane resin that does not contain soluble glass as a control.

Table 3 Contamination rate 1st day 2nd day 4th day 10th day 50th day Silver ion elution amount (unit: 2.5% by weight 0.006 0.006 0.005 or less 0.005 or less 0.004 μg/ c+ff/day) 0.05% by weight o. oooi O. ．． 0001 0.00.01 0.0001 0.0001 5.0% by weight 0.012 0.012 o. oio O. 009 0.006 Ice 12 On tableware coated with paint that does not contain the soluble glass, white mold appears from the second day, followed by yellow mold,
Blue mold occurred. It takes 5 days for white mold to develop on tableware coated with paint containing 0.05% by weight of the soluble glass, and for 7 days when the paint contains 2.5% or 5.0% by weight. No white mold occurred either.

1 Yabuten 2 Dai 2 Green mold and bad odor were observed on the second day on tableware coated with a paint that did not contain the soluble glass, but a paint containing 0.05% by weight of the soluble glass was applied. It took 11 days for the tableware to reach the same condition, and when it was mixed with 2.5% and 5.0% by weight, it took 2.
No change was observed even after 0 days had passed.

Zetin+″l: White mold colonies appeared on the fourth day on tableware coated with a paint that did not contain the soluble glass, but when a paint containing 0.05% or more of the soluble glass was coated. No change was observed in the tableware even after 7 days.

．． I! FJLL: Does not contain the meltable glass or 0
．． White mold developed on the third day on the tableware coated with the paint containing 2.5% by weight of the soluble glass.
No change occurred in the tableware coated with the paint containing 5.0% heavy weight even after 10 days.

Mitsubishi Futoshih: On the third day, rotten areas thought to be caused by mold were observed on tableware coated with a paint that did not contain the soluble glass, but with the paint containing 0.05% of the soluble glass. It took 7 days for the tableware coated with this to reach the same condition, and no change was observed even after 10 days when 2.5% by weight and 5.0% by weight were mixed. .

(Effects of the Invention) As explained above, the tableware of the present invention contains fine particles of soluble glass that can elute silver ions at a constant rate.
By dispersing it in tableware resin or tableware paint, it can exhibit stable antiseptic and anti-mold effects over a long period of time. Moreover, since the melting rate of the glass can be strictly controlled depending on the glass composition, it is possible to stably elute silver ions in a much smaller amount than the generally said dark value at a constant rate, making it non-toxic and safe for the human body. It is completely safe. In addition, sufficient effects can be obtained even with a small amount of soluble glass, so even if a paint containing soluble glass is used, there is no difference in appearance from conventional tableware. Therefore, the present invention greatly contributes to the development of industry and the improvement of welfare as tableware having antiseptic and anti-mold properties that solves all the conventional problems at once.

Claims (1)

[Scope of Claims] 1. Tableware having antiseptic and anti-mold properties, characterized in that soluble glass from which silver ions can be gradually eluted is dispersed and mixed in resin for tableware or paint for tableware. 2. The elution rate of silver ions from the tableware surface is 0.0001.
The tableware having antiseptic and anti-mold properties according to claim 1, wherein the content is 1.0 μg/cm^2/day.