JPH08143409A - Antibacterial and antifungal joint filler compound and antibacterial and antifungal joint filler containing the same - Google Patents

Abstract

PURPOSE: To provide an antibacterial and antifungal joint filler compound which develops sufficient antibacterial and antifungal effect for a prolonged period on the without any adverse effect on human bodies. CONSTITUTION: This antibacterial and antifungal joint filler compound is prepared by using silver as an antimicrobial agent, using an inorganic colloid solution to give a silver nitrate inorganic colloidal solution, then diluting the colloidal solution with an appropriate amount of water. The inorganic colloidal solution is neutral-weak alkaline and any colloidal solution can be selected as for as it does not color. The colloidal solution preferably has a viscosity of about 1-10cp. The silver nitrate is dissolved in water in a concentration of 0.1-1.0wt.% calculated as metallic silver and the silver nitrate and the inorganic colloidal solution are mixed at a weight ratio of about 5/95-30/70Ag/ colloid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a kneading solution for a joint material, which is used for kneading a joint material for a tile used for a wall surface of a bathroom or the like, and has excellent antibacterial and antifungal properties. The present invention relates to a kneading liquid for an antibacterial / mold-proof joint material, which has an excellent antibacterial / mold-proof effect on a joint material using the same.

[0002]

2. Description of the Related Art With the increase in the number of reinforced concrete houses in recent years, there is a concern that infections may occur and the aesthetics of the living environment may be impaired due to the deterioration of hygiene due to the growth of mold in the houses. . In particular, it is most common to use tiles for the interior of bathrooms, etc.
It has been pointed out that molds are likely to occur particularly in the joint material of tiles in such a humid part.

[0003] Conventionally, as a measure against mold in the above-mentioned living environment, a method of removing mold each time it occurs by using a cleaning agent or a bleaching agent is generally used. However, even if such a cleaning agent or a bleaching agent is used, it is difficult to remove the mold once generated, and even if it can be removed, there is a problem that only a temporary effect is obtained. Moreover, most of these cleaning agents or bleaching agents are chlorine-based and highly toxic, and there is a concern that workers who try to remove mold may inhale chlorine gas or that the chemical may adhere to the skin. It had been.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can exhibit sufficient antibacterial and antifungal effects, can be used for a long period of time, and has no adverse effect on the human body. It is intended to provide a kneading liquid for an antibacterial / mildew-proof joint material and an antibacterial / mildew-proof joint material using the same.

[0005]

[Means for Solving the Problems] The problem is to use silver, which is effective as an antibacterial / antifungal agent, to prepare a silver nitrate inorganic colloidal solution using an inorganic colloidal solution for supporting this silver. It is solved by appropriately diluting with water and using it as a kneading liquid for joint materials.

Hereinafter, the present invention will be described in detail. The kneading liquid for an antibacterial / antifungal joint material of the present invention contains an inorganic water-based material having antibacterial / antifungal properties, silver nitrate as an antibacterial / antifungal agent, and a colloidal solution of inorganic fine particles. It consists of

It has been known so far that silver is effective as an antibacterial and antifungal agent. However, if silver is used as a simple substance of silver in a kneading agent for a joint material, it is necessary to significantly change the conventional manufacturing process and it is difficult to handle. Therefore, in the kneading liquid for antibacterial / antifungal jointing material of the present invention, silver nitrate which is easily soluble in water is used to supply silver, and the inorganic colloidal solution is used to support the silver, whereby antibacterial / antibacterial properties are obtained. It is possible to easily fix silver as a fungicide in the joint material, and to realize excellent antibacterial and antifungal effects.

As the above-mentioned inorganic colloidal solution, it is necessary to avoid an acidic liquid having an acidic liquidity because it may hinder the solidification reaction of the joint material, but it is a neutral to weakly alkaline liquid which is colored. Unless it is used, any type can be used, and those having a viscosity of about 1 to 10 cp are suitable.

If the concentration of silver nitrate as an aqueous solution of silver nitrate is less than 0.1% by weight in terms of metallic silver, antibacterial and antifungal effects cannot be expected, and if it exceeds 1% by weight, coloring by silver occurs. Also, when mixed with a colloidal solution,
When the concentration is high, the colloidal solution loses stability, and there is a high possibility of forming flocs (aggregates) and settling, so the concentration converted to metallic silver should be 0.1-1.0% by weight. It is suitable to prepare and use.

When the above-mentioned silver nitrate aqueous solution and the inorganic colloidal solution are mixed, in order to obtain the desired antibacterial and antifungal effects and avoid the disadvantages such as coloring, the weight ratio is 5:95 to 30:70. It is desirable to mix to a certain degree. Further, the silver nitrate inorganic colloidal solution thus prepared can be used after diluting it with water depending on its use condition. At this time, the amount of water used is preferably 300 volumes or less with respect to 1 volume of the silver nitrate inorganic colloid solution, because an excessive amount of water causes precipitation.

By the way, since the above-mentioned silver nitrate aqueous solution exhibits nitric acid acidity, there is a concern that the liquid property of the joint material is made acidic to inhibit the solidification reaction of the joint material. Since a small amount of this silver nitrate aqueous solution is mixed to form a kneading solution, which is further diluted with water and kneaded with the joint material, it should be used without any problem as it has almost no effect on the pH of the joint material. You can

In the joint material prepared as described above, most of the silver is in the form of ions and adheres to the surface of the inorganic colloid particles. This phenomenon is remarkable especially in the case where the surface charge of the inorganic colloidal particles is negative, and it is considered that the silver ions are gradually reduced to metallic silver by ultraviolet rays in sunlight. It is possible to accelerate the reduction with formaldehyde or glucose,
If such a reducing agent is added in advance, it may precipitate as a simple silver before kneading the joint material and may not adhere to the surface of the ultrafine particles. Therefore, the reducing agent may not be used in the present invention. desirable.

Hereinafter, examples will be shown to clarify the action and effect. The test pieces of Examples A to E were prepared using a commercially available tile joint cement as a base. Also, a comparative example, which is a conventional joint material, was prepared by using a commercially available joint cement for tiles. Table 1 shows the composition of each example and comparative example.

[0014]

[Table 1]

Colloidal silica AT-20 (manufactured by Asahi Denka Kogyo; SiO ₂ 20%) was used as an inorganic colloidal solution, and a 0.31% silver nitrate aqueous solution (100% by weight as metallic silver was added to 100 parts by weight of this colloidal silica AT-20). Two
%) Was mixed, and 90 parts by weight of pure water was added to dilute the mixture to obtain a kneading solution. Commercially available tile joint cement 100
A joint material was formed by mixing 60 parts by weight of a mixture of pure water and the kneading liquid with respect to parts by weight. The mixing ratio of pure water / kneading at this time was as follows for each example (A ... 4)
0/20, B ... 50/10, C ... 55/5, D ... 58 /
2, E ... 59/1). Next, the joint material immediately after being mixed as described above is poured into each 25 ml styrene bottle (inner diameter of about 25 mm), cured for 24 hours or more, and then taken out, and the cured product in a columnar shape is cut into slices to form a disc. Shaped test pieces A to E were obtained. In addition, 100 parts by weight of a conventional joint cement for tiles is added to 36 parts of pure water.
A joint material containing 1 part by weight was constructed as a comparative example, and a disc-shaped test piece was formed in the same manner as the test pieces of Examples AE.

A mold growth test was carried out using the test pieces of Examples A to E and the comparative example, and comparative examinations were carried out. (Test 1) The test pieces of the above-mentioned Examples A to E and the comparative example were placed on a potato dextrol agar medium, and these test pieces were subjected to Alternaria alternata.
sprinkled evenly with the bacterial solution of (ta). The mold generation state was observed 3 days and 5 days after this treatment and evaluated according to the following evaluation criteria, and the results are shown in Table 2. : No growth of mold: Slight growth (less than 10%): Slight growth (10-30%): Medium growth (30-60%): Very growth (60-100%)

[0017]

[Table 2]

From the results of Table 2, in the comparative example, 3 of the bacterial solution treatment was performed.
After the lapse of days, the mold was already in a very proliferated state, whereas in the Examples, the growth of the mold was generally suppressed, and in Examples A, B and C, the application was continued after 5 days. The condition of the mold that had been treated was limited to a little proliferation,
In particular, in Example A, slight growth (10
Since it is less than%), it can be seen that the mold growth rate is most suppressed.

Next, a bacterial culture test was carried out for antibacterial properties using the test pieces A to E and the conventional example, and comparative examinations were conducted. (Test 2) A diluted Escherichia coli solution was applied on a normal agar medium, and test pieces A to E and a conventional example were respectively placed thereon, and after 48 hours at 37 ° C., a halo ( The formation of (inhibition zone) was observed, and the results are shown in Table 3.

[0020]

[Table 3]

From Table 3, in the comparative example, the bacterium grew on the entire surface of the agar medium, whereas in Examples A to E, the halo in which the Escherichia coli applied to the periphery of the test piece did not grow was formed. It can be seen that the test pieces of Examples A to E are certainly provided with antibacterial properties. In addition, the formed halos are broadly formed in the order of higher mixing ratio of the kneading liquid in the joint material in each example, showing that the halo is formed most widely in Example A and has the highest antibacterial property. There is.

Further, a mold generation test was carried out using the test pieces A to E and the conventional example, and comparative examination was conducted. (Test 3) Test pieces A to E and the conventional example 10 cm × 10 cm
Adhesive was attached to the plastic plate of No. 3, and after 3 months in the bathroom of the reinforced concrete house as an environment where the occurrence of mold was frequently observed, the condition of the mold was observed and the results are shown in Table 4. Indicated. In the evaluation, the same evaluation criteria as in Test 1 were used.

[0023]

[Table 4]

From the results shown in Table 4, moderate growth was observed in the conventional example, whereas in all the examples, the growth did not occur or the growth was less than 10%, which markedly suppressed the growth of mold. You can see that

[0025]

As described above, the kneading liquid for antibacterial / antifungal joints of the present invention comprises an aqueous solution of silver nitrate and a colloidal solution of inorganic fine particles, and has silver having antibacterial / antifungal effects. It is supplied from silver nitrate, and an inorganic colloidal solution is used to support this silver. Since silver is used as an antibacterial / antifungal agent, it has excellent durability and can be used as a kneading liquid in the same way as conventional products, so there is no need to go through a new step when kneading with joint materials. .

Further, the joint material using the kneading liquid for antibacterial / antifungal joint material of the present invention for kneading can be easily prepared in the same manner as the conventional product, and the above-mentioned antibacterial / antifungal agent can be easily prepared. Since the kneading liquid for the adhesive joint material has excellent durability, it is possible to maintain excellent antibacterial and antifungal properties for a long period of time. Therefore, it is not necessary to frequently perform the removal work each time mold is generated, and it is possible to avoid the risk of the worker inhaling harmful substances.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C04B 28/02 // E04B 1/62 Z C04B 103: 69 (72) Inventor Tomohiko Iijima Funabashi, Chiba Prefecture 585, Toyotomi-cho, Sumitomo Osaka Cement Central Research Institute (72) Inventor Yoshitomo Inoue 585, Tomi-cho, Funabashi, Chiba Sumitomo Osaka Cement Central Research Institute

Claims (2)

[Claims] 1. A kneading liquid for an antibacterial / antifungal joint material, which comprises a colloidal solution of inorganic fine particles supporting silver nitrate. 2. An antibacterial / antifungal joint material, which comprises the kneading liquid for antibacterial / antifungal joint material according to claim 1.