JPH06192021A - Method for cleaning sand in sandbox - Google Patents

Abstract

PURPOSE:To provide a method for cleaning sand in a sandbox, capable of reducing various saprophytes as Escherichia coli and eggs of ascaris in sand by a method safe to human body, maintaining the effect in the open air for a long period of time. CONSTITUTION:Particles of inorganic antimicrobial agent capable of eluting silver ion or copper ion is dispersed into sand particles in a sandbox. At least one selected from the group consisting of antimicrobial zeolite, antimicrobial amorphous aluminosilicate, antimicrobial interlayer compound and soluble glass is used as the inorganic antimicrobial agent. In the case of silver-containing soluble glass, the blending ratio is about 0.01-20wt.% by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying sand for sandboxes such as parks.

[0002]

2. Description of the Related Art It has been investigated that pets such as dogs and cats infiltrate the sandboxes installed in parks and leave excrement, so that a large amount of bacteria and roundworm eggs including E. coli are contained in the sandboxes. The result turned out. For this reason, various bacteria may attach to the hands and fingers of infants playing in the sandbox, which may impair their health. Also, although roundworm eggs that parasitize pets do not become adults even if they enter the human body,
May cause abdominal pain. Therefore, it is considered to prevent the pet from entering by putting a wire mesh around the sandbox, but there is a problem that it becomes difficult to use the sandbox.
It was difficult to completely prevent the invasion of cats and the like.

It is also conceivable to spray insecticides and bactericides in the sandbox, but since insecticides and bactericides have a risk of affecting the human body, they have not been used actually, and outdoors. As it volatilizes and is decomposed by sunlight, etc.,
There is also a problem that the effects of insecticides and fungicides are lost in a short period of time.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and is able to reduce bacteria such as Escherichia coli in the sand and roundworm eggs by a safe method for the human body, and its effect. The present invention has been completed in order to provide a method for purifying sand for sandboxes that can be maintained outdoors for a long time.

[0005]

The present invention completed to solve the above-mentioned problems is selected from the group consisting of antibacterial zeolite, antibacterial amorphous aluminosilicate, antibacterial intercalation compound, and soluble glass. The particles of at least one inorganic antibacterial agent are dispersed in the sand particles.

Among such inorganic antibacterial agents, the antibacterial zeolite is one in which ion-exchangeable ions in zeolite are replaced with ions capable of eluting antibacterial silver ions and / or copper ions. The antibacterial amorphous aluminosilicate is an aluminosilicate in which ion-exchangeable ions are replaced with ions capable of eluting antibacterial silver ions and / or copper ions. The antibacterial intercalation compound is one in which a silver complex salt is supported between layers of an inorganic layered compound. The antibacterial soluble glass is one in which silver and / or copper is contained in glass that melts at a predetermined rate when contacted with water. Among these, it is most preferable to use the silver-containing soluble glass from the viewpoint of stability, safety and antibacterial effect.

This antibacterial soluble glass gradually elutes silver or copper ions over a long period of time, and can prevent bacterial growth or kill roundworm eggs by the antibacterial effect of silver or copper ions. It is possible. In the case of the silver-containing soluble glass, it is preferable to mix it in the range of 0.01 to 20 parts by weight with respect to 100 parts by weight of sand. This is because if it is less than this, the effect is small and if it is more than that, it is uneconomical.

The particle size distribution of sand in an existing park was measured and found to be 2.1% for 106 μm or less, 106-250 μm.
Is 7.7%, 250-500 μm is 28.3%, 500-840 μm is
24.3%, 840-2000 μm is 25.4%, 2000-4000 μm is 1
1.8% and 0.4% at 4000 μm or more. The particle size of the inorganic antibacterial agent should be the same as that of the sand in the park to ensure uniform dispersion.
It is desirable that the particle size be m or less.

[0009]

When the particles of the inorganic antibacterial agent capable of eluting silver ions and / or copper ions are dispersed in the sand particles as described above, the antibacterial effect of the inorganic antibacterial agent can be obtained by contact with rainwater or underground water. Efficient silver ions and copper ions are eluted to prevent the propagation of various bacteria such as Escherichia coli in the sand and to kill roundworm eggs. Therefore, even if an infant playing in the sandbox puts sand in his mouth, he does not have to worry about his health. In addition, silver ions and copper ions are safe for the human body, and if silver-containing soluble glass is used, its efficacy can be stably maintained for a long period of about 2 years.

[0010]

Example: Ag ₂ O was added in an amount of 0.5% by weight to 100 parts by weight of a soluble glass having a composition of 55% by mole of B ₂ O ₃ , 10% by mole of Na ₂ O, 5% by mole of CaO and 30% by mole of SiO ₂ . The material was melted, crushed by a roll crusher, and then classified so as to have a particle diameter of 840 μm or less to obtain particles of silver-containing soluble glass. On the other hand, when sand was sampled from five places in the sandbox of the park and the number of viable bacteria was measured, the results shown in Table 1 were obtained.

[Table 1]

In Example 1, 0.5 part by weight of silver-containing soluble glass particles was added to 100 parts by weight of sand in the above sandbox.
In Example 2, 2.0 parts by weight was added. Then, the viable cell count per 1 g of sand was measured after 6 hours and 24 hours, and the results shown in Tables 2 and 3 were obtained. In the examples, it can be seen that the number of viable bacteria in the sandbox is significantly reduced.

[0012]

[Table 2]

[Table 3]

[0013]

Industrial Applicability As described above, the method for purifying sand for sandboxes of the present invention disperses the particles of the inorganic antibacterial agent in the sand particles, so that various bacteria such as Escherichia coli in the sandbox are safe for the human body. It can reduce roundworm eggs. Moreover, since these inorganic antibacterial agents can maintain their effects outdoors for a long period of time, there is an advantage that the number of maintenance steps can be reduced. Therefore, according to the present invention, it is not necessary to surround the sandbox with a wire net or the like, and an infant or the like can be played without anxiety.

Claims (2)

[Claims] 1. Particles of at least one inorganic antibacterial agent selected from the group consisting of antibacterial zeolite, antibacterial amorphous aluminosilicate, antibacterial intercalation compound, and soluble glass are dispersed in sand particles. A method for purifying sand for a sandbox, which is characterized in that 2. The method for purifying sand for sandbox according to claim 1, wherein the inorganic antibacterial agent is a soluble glass containing silver and / or copper.