JPH0768655A - Antibacterial acrylic film - Google Patents

Abstract

PURPOSE:To improve weather resistant discoloring, chemical resistance, contamination resistance, etc., by forming of an acrylic resin having a specific weight and an antibacterial agent containing a zinc oxide compound as a main ingredient. CONSTITUTION:The antibacterial acrylic film is formed of 100 pts.wt. of an acrylic resin and 0.1-40 pts.wt. of an antibacterial agent containing a zinc oxide compound as a main ingredient. As a material of the film, methyl methacrylate, ethyl methacrylate, propylmethacrylate, etc., are included. The agent contains the zinc oxide compound as a main ingredient, and is a composite zinc oxide with zinc suboxide, zinc oxide, silicon, cobalt, barium, etc. This film is used by thermal laminating, in-mold forming or laminating it to various base materials via an adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic film having antibacterial properties and a wallpaper made thereof.

[0002]

2. Description of the Related Art An acrylic film obtained from an acrylic resin is used to suppress deterioration of weather resistance of a base material by adhering or laminating it.
Since it is possible to impart design characteristics and prevent adhesion of dirt, the demand thereof is increasing in recent years.

Plastic materials such as vinyl chloride resin and ABS resin are used outdoors, in kitchens, bathrooms, toilets or washbasins,
Alternatively, when used around water such as home appliances, it is widely practiced to add various antibacterial agents to the resin in order to suppress the growth of bacteria. The acrylic film is used by adhering or laminating it to the above plastic products, but if this is done, the antibacterial performance imparted to the substrate will be impaired.

[0004] On the other hand, wallpaper has been known to be laminated on a wall or ceiling in a room to improve its appearance. Vinyl wallpaper, inorganic wallpaper and the like are known, but they are liable to be discolored by weathering, easily soiled, and hard to remove stains. Has the problem of. As a countermeasure against this, in some wallpapers, an acrylic, polyester, polyethylene, or other film is attached to the compound layer mainly composed of polyvinyl chloride resin, or acrylic resin, urethane resin, urethane acrylic resin is used. Processing such as coating with paint is performed. Among them, the wallpaper on which the acrylic resin film is laminated is excellent in weathering discoloration, chemical resistance, stain resistance and the like.

Further, the wallpaper used around the water in the kitchen, bathroom, toilet or washbasin in the room is apt to be moldy. Therefore, it is known to add an antifungal agent to an acrylic resin film. However, antifungal agents cannot suppress the growth of bacteria.

Further, nosocomial infections have become a problem in hospitals and the like, and antibacterial properties are required not only in floor materials and curtains but also in wallpaper. In addition, antibacterial wallpaper is required even in places where there are many people with weak resistance such as nursing homes, nursery schools, and kindergartens.

In order to solve these problems, various antibacterial agents may be added to the acrylic film, but the processing temperature of the acrylic resin is usually about 250 ° C., and the acrylic resin composition containing the antibacterial agent is added. However, there is a problem that it is thermally deteriorated during processing, resulting in poor appearance and discoloration. Further, there is a problem that even an inorganic antibacterial agent which is considered to have excellent heat resistance is discolored during processing or a weather resistance test.

[0008]

The gist of the present invention is to provide an antibacterial acrylic film comprising 100 parts by weight of an acrylic resin and 0.1 to 40 parts by weight of an antibacterial agent mainly containing a zinc oxide compound. An antibacterial wallpaper is obtained by laminating the film on a wallpaper support.

The material of the acrylic resin film used in the present invention is not particularly limited, but methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate are used as main raw materials, and if necessary, have 1 to 10 carbon atoms. A homopolymer or a copolymer obtained by using an acrylic ester having an alkyl group of 8, vinyl acetate, vinyl chloride, styrene, acrylonitrile, methacrylonitrile or the like as a copolymerization component is used. Furthermore, Japanese Examined Patent Publication No. 62-19309,
JP-A-63-20459 and JP-A-63-7796.
An acrylic resin copolymerized in multiple stages as described in Japanese Patent Publication No. 3 can be used.

The antibacterial agent used in the present invention mainly contains a zinc oxide compound. Examples of the zinc oxide compound include zinc suboxide, zinc oxide, composite zinc oxide with silicon, cobalt, barium, and the like. Specific examples of this antibacterial agent include "Biocide (trade name) 300D" manufactured by Taisho Technos Co., Ltd. and "Shoo Cleanse" (trade name) manufactured by Rasa Industry Co., Ltd.

The content of the antibacterial agent is 0.1 parts by weight or more based on 100 parts by weight of the acrylic resin from the viewpoint of antibacterial property, and 40 parts by weight or less from the viewpoints of film-forming property, appearance and economy. Is desirable. It is preferably 0.3 part by weight or more and 20 parts by weight or less.

As the method for producing the antibacterial acrylic film of the present invention, any method such as a melt casting method of an acrylic resin containing a predetermined amount of an antibacterial agent, a melt extrusion method such as a T-die method, an inflation method or a calender method can be used. Although the method may be used, the T-die method is preferable from the viewpoint of economy.

In the antibacterial acrylic film of the present invention, if necessary, general compounding agents such as stabilizers, lubricants, processing aids, plasticizers, impact resistance aids, foaming agents, filling agents, colorants, An ultraviolet absorber or the like can be included.

The antibacterial acrylic film of the present invention can be used by laminating it to various substrates by means such as heat lamination, in-mold molding, or adhesion with an adhesive. Lamination is a very useful method because it can efficiently disperse expensive antibacterial agents on the surface, and is widely applied to wallpaper, bathroom / toilet seats, household electric appliances such as public phones and washing machines, etc. It is a technology that can be done.

In particular, a wallpaper obtained by laminating the antibacterial acrylic film of the present invention on a wallpaper support such as vinyl chloride resin is excellent in weathering discoloration, chemical resistance, stain resistance and the like.

[0016]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. In the description, "part" means "part by weight".

As an acrylic resin, Mitsubishi Rayon Co., Ltd.
The product "Hi-Pet (trade name) HBS-001" was used.
To 100 parts of this resin, "Biocide 300D" manufactured by Taisho Technos Co., Ltd. as an antibacterial agent was blended at a ratio shown in Table 1, and the mixture was shaped into pellets at 240 ° C from a 30 mmφ twin-screw extruder at a discharge rate of 8 kg / hour. . For comparison, "Bioside 905A" and "Bioside 87" manufactured by Taisho Technos Co., Ltd., which use organic nitrogen compounds as antibacterial agents.
1 ", the company's" Bioside 843 "which uses an organic sulfur halogen compound as an antibacterial agent," BACTEKILLER "(trade name) manufactured by Kanebo Co., Ltd. in which antibacterial silver is immobilized on zeolite, and an antibacterial agent-free system" The HBS-001 "simple substance was similarly shaped.

[0018]

[Table 1]

Regarding the obtained pellets, anoxic state,
Heat for 1 hour under the condition of 240 ℃, observe the appearance change,
The heat resistance was evaluated. The results are shown in Table 2. From Table 2, it can be seen that the blending amounts of Examples 1 to 3 are excellent in thermal stability.

[0020]

[Table 2]

Next, the obtained acrylic resin composition (pellets) was extruded under the following conditions to obtain 14 kinds of films. 40 mmφ (screw diameter) extruder with 300 mm T die Resin temperature 245 ° C. Discharge rate 15 kg / hour (for thickness 20 μm) Medium of the obtained film Comparative Example 8 has a lot of lumps, Comparative Example 2, Comparative Example 9 and Comparative Example 10 Because of its perforation, none of them could be used as an acrylic film in terms of appearance. All of the other films had good appearances.

The antibacterial acrylic film thus obtained was evaluated as follows. Echerichia coli IFO as antibacterial test (contact method) cells
Using 12734 strain, each of these strains was inoculated into trypto soya broth medium, shake-cultured at 30 ° C. for 18 hours, then centrifuged, washed three times with sterile physiological saline, and then washed.
It was diluted 0 times to obtain a bacterial suspension. Sterilize by adding 10 ml of phosphate buffer solution (pH 7.2) to a Meyer flask,
0.1 ml of the above-mentioned bacterial suspension was inoculated to obtain a culture solution.

The acrylic film obtained as described above was cut into a bag having an internal surface area of 5 cm × 10 cm. The cultured Escherichia coli suspension was diluted and 0.1 ml was dispensed into the prepared bag so that the bacterial suspension could spread in the bag. This was put in a sterilized polyethylene bag and cultured at 30 ° C. for 24 to 48 hours, and the viable cell count was measured by the pour method. The results are shown in Table 3. It is clear from Table 3 that Examples 1 to 3 and Comparative Examples 5 and 6 have excellent antibacterial properties.

[0024]

[Table 3]

Examples 1 to 3, Comparative Examples 1, 3 to 7 and 11
The antibacterial property test against Escherichia coli was performed on the wallpaper obtained by pasting the acrylic film obtained in 1. above with a wallpaper made of vinyl chloride resin using a heating roll in the same manner as above. The results are shown in Table 4.

[0026]

[Table 4]

Claims (2)

[Claims] 1. An antibacterial acrylic film comprising 100 parts by weight of an acrylic resin and 0.1 to 40 parts by weight of an antibacterial agent mainly containing a zinc oxide compound. 2. An antibacterial wallpaper obtained by laminating the antibacterial acrylic film of claim 1 on a wallpaper support.