JPH05917A - Antibacterial composition and method for producing the same - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the heat resistance during resin molding and the colorability of a resin kneading type antibacterial and antifungal composition. [Structure] The average particle size is 0.1 to 10 μm, “JISZ
B-type silica gel described in "0701 Silica gel desiccant for packaging" is used as a carrier, and this silica gel is loaded with Moso bamboo extract. With this configuration, the thermal stability of the antibacterial composition against heat applied during molding of the synthetic resin is improved. Further, since the refractive index of silica gel is close to that of synthetic resin, it does not affect various characteristics such as the surface state of synthetic resin and the dispersibility of light. Furthermore, the aged colorability of the resin can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial composition which is dispersed in a synthetic resin and imparts antibacterial properties to the surface of the synthetic resin, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as this kind of antibacterial composition,
Inorganic type and organic nitrogen type are known. Organic nitrogen-based compounds have very high sterilization performance, but are highly toxic to the human body and pollute the environment.

[0003] In recent years, synthetic resin products have been widely used, and contamination of the surface of synthetic resin products by bacteria has become a problem. The above-mentioned organic antibacterial agent is used in order to disperse a bactericidal component in a synthetic resin and to volatilize and elute the bactericidal component on the surface of the resin to sterilize the environment surrounding the resin.

[0004]

However, with some conventional organic nitrogen-based antibacterial agents, the antibacterial agent contained in the resin flows out into the liquid that has passed through the surface of the resin. In addition to polluting the drainage environment with a liquid containing sewage, it has a problem of inhibiting the activity of activated sludge in the sewage treatment equipment.

The present invention solves such a problem and has an antibacterial effect on the surface of a synthetic resin product, does not pollute the environment, and does not change the properties of the synthetic resin subjected to the antibacterial and antifungal treatment. The present invention aims to provide a sex composition.

[0006]

Means for Solving the Problems The present invention uses B-type silica gel having a mean particle size of 0.1 to 10 μm as described in “JISZ 0701 silica gel desiccant for packaging” as a carrier, and 100 parts by weight of this silica gel A mixture of 0.2 to 10 parts by weight of Moso bamboo extract in 50 to 200 parts by weight of a solvent such as ethyl alcohol or methyl alcohol is dispersed and mixed, and the mixture is quickly dried and then pulverized to produce an antibacterial composition. It is the one.

[0007]

[Function] By rapidly adsorbing the Moso bamboo extract having antibacterial and antifungal action on the B-type silica gel carrier described in JIS, which has a high moisture absorption and adsorption ability, the Moso bamboo extract is prevented from evaporating and the thermal stability is improved. Further, when the antibacterial composition of the present invention is dispersed in a synthetic resin to give the surface of the synthetic resin antibacterial properties, the moldability of the synthetic resin is improved.

Furthermore, as a carrier for adsorbing the antibacterial composition, as a light-transmitting material having a refractive index similar to that of a synthetic resin, the moisture absorption rate is relatively small in the low humidity region and the total moisture absorption and adsorption amount is low. A large amount of B-type silica gel is used and dispersed in a synthetic resin to mold the synthetic resin. By doing so, the antibacterial and antifungal composition particles protrude onto the resin surface, but by using silica gel powder having a particle size that does not impair the smooth gloss of the resin surface, the surface condition of the synthetic resin is not impaired, and It is possible to impart antibacterial performance to the surface of the synthetic resin without coloring the synthetic resin during long-term storage.

[0009]

EXAMPLE An example of the present invention will be described below.

The silica gel used in this example is B type silica gel described in JIS, which has a relatively low moisture absorption rate at low humidity and a large total moisture absorption amount, and has an average particle size of 2.6 μm. Something was used. This silica gel powder is prepared by drying at 180 ° C. for 2 hours or more.

To 100 parts by weight of this silica gel, 95 parts by weight of ethyl alcohol and 5 parts by weight of Moso bamboo extract were dissolved and mixed with the above silica gel, and dried at a temperature slightly higher than the boiling point of the solvent used. After promptly releasing the adsorption solvent and the absorbed moisture, the particles were pulverized to a target particle size to obtain an antibacterial composition.

The antibacterial composition produced by the above method is cured and molded into a resin molded product in which about 5 parts by weight of the antibacterial composition is uniformly dispersed in 100 parts by weight of the resin when the unsaturated polyester resin is molded, An antifungal test and an antibacterial test as shown below were conducted.

The anti-mold test was based on the halo test method based on the mildew resistance test for textiles of the Japanese Industrial Standards mold resistance test (JIS Z 2911). The mold used was Cladosporium clado.
sporioides), Chaetomium glo
bosum), Penicillium citrinum (Penicilliumcitr
inum), Aspergillus nige
In r), the evaluation was carried out 14 days later. For antibacterial tests, Escherichia coli (Escherichia coli), Staphyrococcus aureus, and Bacillus subtilis were used.
The hello test method was performed and the evaluation was performed 7 days later. As a result, the antibacterial spectrum shown in (Table 1) was obtained, and practical antibacterial and antifungal performance was confirmed.

[0014]

[Table 1]

In this embodiment, only the Moso bamboo extract was used as the antibacterial and antifungal material, but a plurality of kinds of antibacterial and antifungal materials may be used.

Further, when the antibacterial composition of the present invention is dispersed in a synthetic resin and used for the purpose of imparting antibacterial properties to the surface of the synthetic resin, the heat resistance of the antibacterial and antifungal material against heat during resin molding is improved. Not only is it improved, but the effect of suppressing the aged color change of the synthetic resin due to the antibacterial and antifungal material in the resin is obtained.

Instead of finely divided silica, the particle size is about 5 μm.
Similar effects can be obtained when m zeolite powder is used.

[0018]

EFFECTS OF THE INVENTION As is clear from the description of the above examples, the antibacterial composition of the present invention is a plant extract in which highly safe antibacterial Moso bamboo extract is rapidly adsorbed on a silica gel carrier, The composition can be dispersed in a synthetic resin to impart antibacterial properties to the synthetic resin. In this case, the antibacterial composition of the present invention is characterized by being relatively stable against heat during resin molding and being easily dispersed uniformly in the resin. In addition, by using silica gel as a carrier, which has a light refractive index and light transmittance comparable to those of synthetic resin, has a relatively low moisture absorption rate in a low humidity atmosphere, and has a large total amount of absorbed moisture, the synthetic resin is colored. Antibacterial performance can be imparted without performing.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mariko Tomita             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Atsushi Nishino             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (3)

[Claims] 1. An antibacterial composition which uses silica gel as a carrier and adsorbs Moso bamboo extract on the silica gel. 2. The carrier silica gel has an average particle size of 0.1 to 0.1.
The antibacterial composition according to claim 1, which is the B-type silica gel described in "JIS Z0701 Silica gel desiccant for packaging" having a thickness of 10 µm. 3. A JISZ having an average particle size of 0.1 to 10 μm.
0.270 of Moso bamboo extract in 100 parts by weight of B-type silica gel described in "0701 Silica gel desiccant for packaging", 50 to 200 parts by weight of ethyl alcohol or methyl alcohol.
A method for producing an antibacterial composition, which comprises dispersing and mixing 10 to 10 parts by weight of a mixed liquid, rapidly drying, and then pulverizing.