JP2586247B2 - Mold-proofing method for cement-based tile joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing fungal cement tile joints, and more particularly to a method for preventing cement mold tile joints from effectively forming mold for a long period of time. It relates to an antifungal method.

[0002]

2. Description of the Related Art A joint material used for tile construction is a cement mortar mainly composed of white cement and fine aggregate. In general, the hardened cement contains calcium hydroxide and exhibits strong alkalinity. For a while after the joint material is applied, mold and bacteria are unlikely to grow due to its strong alkalinity. However, as time passes, the calcium hydroxide contained in the joint material gradually combines with carbon dioxide in the air and changes into calcium carbonate. In particular, in the case of tile joints, since there are many porous finishes, the rate of neutralization is relatively high, and it is considered that the alkali component disappears after one to two years have passed after construction.

[0003] However, if there is no alkali component that inhibits the growth of microorganisms, naturally, fungi and the like easily grow.
Therefore, as a longer-term antifungal measure, it is desirable to automatically supply a trace component capable of inhibiting the growth of microorganisms at the stage when the alkali content of the joint material is neutralized.

Conventionally, attempts have been made to improve the antifungal performance by adding an antifungal agent to a tile joint material. As antifungal agents that have been confirmed for safety and have been put to practical use, there are organic compounds containing halogen, nitrogen, sulfur, and the like.
It is classified into a halogen type, a phenol type, an imidazole type, a thiazole type, a guanidine type, a pyridine type, an organic arsenic compound, an amide type and the like.

[0005] By the way, the performance required as a fungicide (when mixed in a powder state) for tile joints is as follows. (1) Low toxicity and high safety. (2) No irritating odor. (3) Excellent effect can be obtained by adding a small amount. (4) No coloring or discoloration phenomenon. (5) Stable under strong alkalinity. (6) The potency is persistent. (7) The price is appropriate.

[0006]

However, conventionally,
Those satisfying all of the above performance conditions have not been provided. In particular, in many cases, decomposition is promoted under strong alkaline conditions and the effect is lost in a short period of time. For example, a joint material added with a typical antifungal agent such as an imidazole-based agent shows strong fungicidal performance at first, but when the alkali component of the cement of the joint material disappears, the fungicide is eliminated. The fact is that the effect of the agent has been lost.

The present invention solves the above-mentioned conventional problems and provides a fungicide which satisfies the above-mentioned requirements (1) to (7) as the antifungal agent for joint material and is excellent in long-lasting effect. It is another object of the present invention to provide a method for preventing fungicide of a cement-based tile joint that can effectively prevent mold generation of the cement-based tile joint for a long period of time.

[0008]

The method for preventing fungicide of a cement-based tile joint according to claim 1, wherein the fungicide for a cement-based tile joint comprises adding a fungicide to the cement-based tile joint. Is characterized by being one or more of the following iodine compounds which are hardly soluble in water and stable under a strong alkali.

[0009]

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[0010]

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[0011]

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[0012]

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[0013]

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[0014]

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In a second aspect of the present invention, there is provided a method for preventing fungal cement tile joints, wherein the iodine compound is diiodomethyl-p-trisulfone.

As diiodomethyl-p-trisulfone, there is a commercial product "Amical 48" manufactured by Abbott Corporation in the United States.

Hereinafter, the present invention will be described in detail.

In the present invention, the amount of the iodine compound added is not particularly limited, as long as the fungicidal effect is sufficiently obtained and the drug cost and joint properties are not adversely affected. Usually, 0.001 to 1% by weight, especially 0.01 to 1% by weight based on the cement-based tile joint material
It is preferably 0.1% by weight, especially about 0.02 to 0.08% by weight.

The antifungal agent according to the present invention may be added and blended in a predetermined amount in preparing a cement tile joint material.

[0020]

In the present invention, the iodine compound added as a fungicide is a remarkably excellent fungicide which satisfies all of the above requirements (1) to (7). It can be effectively prevented for a long time.

That is, in general, a compound containing iodine is decomposed very little to separate a small amount of iodine, even if it is stable, but when the alkalinity is high (the period during which calcium hydroxide is present), calcium The iodine is apparently inactive due to the binding of the ions and iodine. However, as the neutralization progresses and calcium becomes calcium carbonate, traces of iodine are released.
This free iodine has an excellent antibacterial and antifungal effect. Therefore, by using such an iodine compound, a small amount of iodine can be continuously supplied for a long period of time, so that a cement-based joint material having excellent long-term antibacterial and antifungal properties can be prepared.

Further, the joint material is not colored by the addition, and the appearance of the joint portion is not spoiled. As the fungicide used in the present invention, diiodomethyl-p-trisulfone is particularly preferred.

[0023]

The present invention will be described more specifically below with reference to examples and comparative examples. Example 1, Comparative Example 1 Preparation of test solution The following five kinds of bacteria were mixed and inoculated into a nutrient solution having the following composition.

The species Asperugillus niger Penicillium funiculosum Cladosporium cladosporioides Aureobasidium pullulans Alternaria alternata nutrient solution composition Purified water 1000 ml ammonium nitrate 3.0 g phosphate monopotassium 1.0 g magnesium sulfate (heptahydrate) of 0.5 g potassium chloride 0 .25 g Ferrous sulfate 0.002 g Glucose 10.0 g Peptone 10.0 g Preparation of samples The following agents were added to cement-based tile joints at the following ratios and cured to produce cured products.

[0025]

[Table 1]

A part of each cured product was subjected to the following accelerated deterioration treatment. (A) Forced degradation treatment with hot water: The sample was placed in warm water of 40 ° C. 2 (referred to as “hot water 2”), 4 (referred to as “hot water 4”).
Or 8 (referred to as "hot water 8") days. (B) Neutralization treatment with carbon dioxide gas: A part of the sample after immersion in the above-mentioned hot water was treated with carbon dioxide gas while keeping the humidity in a sealed container.
Cured for days (referred to as “CO ₂ ”).

Test Method Approximately 1 ml of a PDA medium was poured into the center of a Petri dish, and each sample was placed on the Petri dish so as to be pressed. A certain amount (10 ml) of the PDA medium was flowed around the sample and solidified. Next, a mixed spore suspension (test solution) containing nutrients was uniformly sprayed on the sample. Thereafter, the cells were cultured at a temperature of 30 ° C. and a relative humidity of 90%. The conditions on the 7th and 14th days after the start of the culture were observed, and the occurrence of mold was evaluated according to the following criteria. The results are shown in Table 2. In Table 2, numerical values in parentheses indicate the width (mm) of the stop band.

Evaluation criteria +: Molding is observed in a portion within 10% of the surface area. ++: Mold development is observed in a portion within 50% of the surface area. +++: Molding is observed in a portion exceeding 50% of the surface area. -: No mold formation.

[0029]

[Table 2]

From Table 2, it is apparent that the method of the present invention can effectively prevent mold generation of cement-based tile joints for a long period of time even under the adverse effects of exposure to warm water or carbon dioxide gas.

[0031]

As described above in detail, according to the method for preventing fungal cement tile joints of the present invention, mold generation of the cement tile joints can be effectively prevented for a long time even under adverse effects. it can. For this reason, according to the present invention, it is possible to maintain the joints of the tile construction surface such as the bathroom and the outer wall in a hygienic and beautiful manner for a long time.

In particular, according to the antifungal agent of the second aspect, an extremely excellent antifungal effect can be obtained.

Claims (2)

(57) [Claims] 1. A method for preventing fungicide of a cement-based tile joint comprising adding a fungicide to the cement-based tile joint, wherein the fungicide is one or more of the following iodine compounds: Characteristic method for fungicide of cement tile joint material. 4-chlorophenyl-3′-iodoppagylformal diiodomethyl-p-trisulfone polyvinylpyrrolidone iodo 3-iodo-2-propargylbutylcarbamic acid 1-bromo-3-ethoxycarbonyloxy-1,
2-diiodo-1-propene 3-acetoxy-1,1,2-triiodo-1-propene 2. The method according to claim 1, wherein the iodine compound is diiodomethyl-.
A fungus-proofing method for cement-based tile joint material, which is p-trisulfone.