JP2991573B2 - Antimicrobial composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to an antibacterial composition.

[0002]

2. Description of the Related Art In recent years, when synthetic resin products are used extensively, or when used in fields where hygiene needs to be paid attention, such as kitchenware, contamination of bacteria on the surface of the synthetic resin products is caused by bacteria. Is becoming a problem. In addition, there is a problem that bacteria grow on the surface of the caulking material used as a building material, which deteriorates not only hygiene but also appearance. As a countermeasure, a method has been used in which an antibacterial composition is mixed into a synthetic resin and the composition is eluted on the surface of the synthetic resin product to sterilize the product surface.

[0003]

There are an organic antibacterial agent and an inorganic antibacterial agent as materials for imparting antibacterial performance to the surface of a synthetic resin product. Of these antibacterial agents, organic antibacterial agents have volatility, so if they are contained in synthetic resin, the surrounding environment of the synthetic resin product will be polluted, and the wastewater in contact with the surface of this synthetic resin product Contains antimicrobial agents, which cause wastewater pollution,
There are problems such as affecting activated sludge during sewage treatment.

On the other hand, a silver-based antibacterial agent is used as the inorganic antibacterial agent having the highest antibacterial effect in order to impart antibacterial performance. There was a problem of coloring at the molding temperature.

The present invention has been made to solve the above problems, and provides an antibacterial composition which exhibits a stable antibacterial effect on the surface of a resin product and which does not easily cause environmental pollution even if it is eluted from the resin. With the goal.

[0006]

According to the present invention, a water-soluble silver salt, a silver complex salt or a silver compound is supported and adsorbed on silica gel, and calcined at a temperature of 480 ° C to 600 ° C. Things. Further, the present invention provides a method in which a water-soluble silver salt, a silver complex salt or a silver compound is carried and adsorbed on silica gel, and at least a part of the surface of the antibacterial composition baked at a temperature of 480 ° C. or more and 600 ° C. or less has a reactive organic silicon compound. It is formed by coating with a hydrolyzate. Further, in the present invention, a water-soluble silver salt, a silver complex salt or a silver compound is supported on silica gel, adsorbed and dried and pulverized, and at least a part of its surface is coated with a hydrolyzate of a reactive organic silicon compound. It is obtained by firing at a temperature of not more than ℃.

The above water-soluble silver salt, silver complex salt or silver compound may be used as it is. For example, silver acetate is used as a water-soluble silver salt, and after dissolving it in an aqueous solvent, ammonium sulfite and ammonium thiosulfate are used. Silica gel may be placed in the reacted liquid and adsorbed. As the above-mentioned ammonium sulfite and ammonium thiosulfate, ammonium sulfite and ammonium sodium thiosulfate are used. Further, tetraethoxysilane is used as the organic silicon compound.

[0008]

The antibacterial composition of the present invention thus constituted exhibits a stable antibacterial effect on the surface of a resin product, and hardly causes environmental pollution even if it is eluted from the resin. Also, the coloration of the molded resin piece is reduced.

[0009]

Embodiments of the present invention will be described below. Example 1 100 parts by weight of a water-soluble silver salt such as silver acetate, 230 parts by weight of ammonium sulfite, and 180 parts by weight of sodium ammonium thiosulfate were added to and dissolved in water containing no chlorine, and mixed with sufficient stirring to obtain a silver thiosulfato complex. An aqueous solution was obtained.

The carrier used in this embodiment is "JIS Z".
0701 silica gel desiccant for packaging ". The B-type silica gel powder has a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption at high humidity, and has an average particle size of about 8 μm.

The silica gel powder was dried at 180 ° C. for 2 hours or more. The silver thiosulfato complex solution was mixed with 100 parts by weight of the silica gel so that the silver component was 2 parts by weight. Thereafter, the solvent and the water absorbed in the carrier were promptly removed. Next, this was pulverized to a predetermined particle size to obtain silica gel carrying an antibacterial material.

The silica gel was heated to 500 ° C. at a rate of about 10 ° C./min to obtain an antibacterial composition. If the heat treatment temperature is lower than 480 ° C., the antibacterial composition turns dark brown, and if it exceeds 600 ° C., the silica gel is vitrified and the particles grow, so that the composition is not suitable for kneading to a resin.

Table 1 shows the antibacterial performance of the antibacterial composition obtained in Example 1, and Table 1 shows that the antibacterial composition of Example 1 has practical antibacterial performance. In the antibacterial test, Escherichia coli, Staphylococcus aureus, and Bacillus subtillis were used and the dropping method was followed. The evaluation was performed after 24 hours.

Table 1 also shows the coloration of the resin pieces formed by dispersing and kneading 1% of the antibacterial composition of Example 1 in a polypropylene resin.

Example 2 An antibacterial composition was obtained in the same manner as in Example 1, and 100 parts by weight of the above silica gel was added to a solution obtained by diluting 100 parts by weight of tetraethoxysilane as a reactive organosilicon compound in ethyl alcohol. Was dispersed therein, and pure water was added thereto to hydrolyze tetraethoxysilane. At least a part of the surface of the antibacterial composition obtained in Example 1 was coated. Next, this was dried to obtain the antibacterial composition of Example 2.

Table 1 shows the antibacterial performance of the antibacterial composition obtained in Example 2, and Table 1 shows that the antibacterial composition of Example 2 has practical antibacterial performance. In the antibacterial test, Escherichia coli, Staphylococcus aureus, and Bacillus subtillis were used, and the dropping method was followed. The evaluation was performed after 24 hours.

Table 1 also shows the coloration of the resin pieces obtained by dispersing and kneading 1% of the antibacterial composition of Example 2 in a polypropylene resin and molding.

Example 3 In the same manner as in Example 1, a silica gel carrying an antibacterial material was obtained. Silica gel 1 carrying the above antibacterial material in a solution obtained by diluting and mixing 100 parts by weight of tetraethoxysilane as a reactive organic silicon compound in ethyl alcohol.
After dispersing 00 parts by weight, pure water was added thereto to hydrolyze tetraethoxysilane, and at least a part of the surface of the silica gel was coated. It was then dried. The coated silica gel was heated to 500 ° C. at a heating rate of about 10 ° C./min to obtain the antibacterial composition of Example 3.

Table 1 shows the antibacterial performance of the antibacterial composition obtained in Example 3, and Table 1 shows that the antibacterial composition of Example 3 has practical antibacterial performance. In the antibacterial test, Escherichia coli, Staphylococcus aureus, and Bacillus subtillis were used and the dropping method was followed. The evaluation was performed after 24 hours.

Table 1 also shows the coloration of the resin pieces obtained by dispersing and kneading 1% of the antibacterial composition of Example 3 in a polypropylene resin and molding.

Comparative Example 1 A silica gel carrying an antibacterial material was obtained in the same manner as in Example 1 and used without heating.

Using the silica gel of Comparative Example 1 and testing the antibacterial performance and the coloration of the resin pieces in the same manner as in Examples 1 to 3, the results are shown in Table 1. It can be seen that the resin coloration is inferior to Examples 1 to 3 in coloration.

[0023]

[Table 1]

[0024]

As described above, according to the present invention, a resin molded by heat-treating silica gel adsorbing and supporting a water-soluble silver salt, silver complex salt or silver compound at a temperature of 480 ° C. to 600 ° C. The coloration of the piece is small and good antibacterial performance can be exhibited.

Continuation of the front page (56) References JP-A-5-43414 (JP, A) JP-A-5-306207 (JP, A) JP-A-6-125970 (JP, A) JP-A-5-58829 (JP) JP-A-6-87710 (JP, A) JP-A-5-155725 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 59/16 A01N 25/26

Claims (7)

(57) [Claims] 1. An antibacterial composition comprising a water-soluble silver salt, a silver complex salt or a silver compound carried and adsorbed on silica gel and calcined at a temperature of 480 ° C. or more and 600 ° C. or less. 2. An antibacterial composition, wherein a water-soluble silver salt, a silver complex salt or a silver compound is carried and adsorbed on silica gel and calcined at a temperature of 480 ° C. or more and 600 ° C. or less, at least a part of the surface of the reactive organic silicon compound An antibacterial composition characterized by being coated with a hydrolyzate. 3. A water-soluble silver salt, silver complex salt or silver compound is supported on silica gel, adsorbed and dried and pulverized, and at least a part of its surface is coated with a hydrolyzate of a reactive organic silicon compound. An antibacterial composition characterized by being calcined at a temperature of not more than ℃. 4. The method according to claim 1, wherein after dissolving the water-soluble silver salt in the aqueous solvent, silica gel is adsorbed in a liquid obtained by reacting ammonium sulfite and ammonium thiosulfate. Antimicrobial composition. 5. The method according to claim 4, wherein the ammonium sulfite and the ammonium thiosulfate are ammonium sulfite and ammonium sodium thiosulfate.
The antibacterial composition according to any one of the preceding claims. 6. The antibacterial composition according to claim 4, wherein the water-soluble silver salt is silver acetate. 7. The antibacterial composition according to claim 2, wherein the organosilicon compound is tetraethoxysilane.