JP3301959B2 - Antibacterial and antifungal resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition having antibacterial properties, and more particularly to an antibacterial resin composition suitable for use in members constituting an air conditioner.

[0002]

2. Description of the Related Art Synthetic resin materials have a property as a dielectric material or an electric insulating material, so that they can easily adsorb dust, bacteria and mold in the air. Bacteria and mold easily grow. For this reason,
Although the surface of a synthetic resin molded article is coated with a paint containing an antibacterial and fungicide, the coating agent is gradually lost from the surface due to friction or the like, and the antibacterial effect is easily lost. For this reason, there are many known methods in which a synthetic resin material is preliminarily mixed with an antibacterial and antifungal agent and then molded to form a molded product. This antibacterial and antifungal agent is required to have performances such as a broad antibacterial spectrum (effective against many types of molds and bacteria), high safety, and long-lasting effects. In addition, as a method of mixing an antibacterial and fungicide to a synthetic resin material, it is usually performed by melting the synthetic resin material and adding an antibacterial and fungicide to the mixture, and the antibacterial and fungicide itself melts. It is required that it be stable at temperature.

An air conditioner represented by an air conditioner is composed of many members, and most of them are made of synthetic resin materials such as polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and acrylonitrile-styrene copolymer. Polymer (AS), polyethylene (PE),
Polyolefin such as polypropylene (PP), polyamide, polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), acrylonitrile ethylene propylene diene styrene copolymer
Coalesced (AES), acrylonitrile styrene acrylate copolymer (ASA), polyoxymethylene (P
OM) or the like, and calcium carbonate, talc, mica, silica, glass fiber, various whiskers, or the like may be added to these materials as an inorganic filler.
Air-conditioning equipment is exposed to dust, mold, bacteria, etc. in the air because the air circulates inside, and condensation occurs in the summer,
In winter, warm air flows through the interior, making it easy for bacteria and mold to multiply. For this reason, among members constituting an air conditioner, a member that comes into contact with an air flow is particularly made of an antibacterial synthetic resin. This is because a synthetic resin molded article to which an antibacterial agent is added is expected to have an antibacterial and antifungal effect on the surface of the molded article because the antibacterial agent contained therein gradually bleeds out from the surface of the molded article. Is what you do. In this case, as described above, in the air conditioning equipment, dew condensation occurs in the summer and warm air flows in the winter, so that in addition to the physical properties required for general synthetic resin molded products, antibacterial and antifungal properties in the synthetic resin are further increased. It is required that the agent does not dissolve in the dew water and does not volatilize excessively in warm air.

In general, in molded products of crystalline synthetic resins, particularly synthetic resins such as polyethylene, polypropylene and polyamide, the bleed out of the antibacterial agent is accelerated by the influence of heat when the air blower is used, and as a result, it is relatively short. There was a case where the antibacterial and antifungal effect was dissipated with time and disappeared. For this reason, for example, Japanese Patent Application Laid-Open No. 2-140528 discloses that a mixture of a synthetic resin, particularly a crystalline resin, and a mixture of an acrylic resin fine powder and an antibacterial agent added thereto is brought into contact with the airflow of a blower. A method has been proposed in which the antibacterial and antifungal effect is maintained by using it for a member.
On the other hand, among the synthetic resins, when the antibacterial and fungicide are dispersed in the amorphous resin, it is difficult to bleed out from the inside of the resin. It was difficult to obtain antifungal properties. For this reason, Japanese Patent Application Laid-Open No. 8-145392 discloses that an amorphous resin such as PS, AS, or ABS used for each member of an air conditioner is used in combination with at least one of a surfactant, an ultraviolet absorber, and an antioxidant. It has been proposed to improve bleed-out by adding fungicides such as phenols, haloalkyls, benzimidazoles and the like. However, even with these proposed techniques, in the antibacterial resin composition used for each member of the air conditioner, an antibacterial resin composition satisfying all the performances required for the air conditioner as described above was not obtained. .

On the other hand, if a large amount of an antibacterial and fungicide is added to a synthetic resin, a certain antibacterial and fungicidal property can be obtained. Workability such as the possibility that it may not be compatible with the design conditions and the difficulty in managing the dispersion and kneading in the series of processes from compounding the resin and the antibacterial / antifungal agent to molding the member. And other problems. Furthermore, in the case of a conventional antibacterial and fungicide, for example, TBZ (2- (4-thiazolyl) benzimidazole), the antibacterial spectrum is narrow and effective antibacterial and fungicidal properties for a wide range of bacteria and fungi could not be obtained.
Therefore, it has been desired to realize an antibacterial resin composition which has a small amount of an antibacterial and fungicide added, is effective against a wide range of bacteria or fungi, and has a long-lasting antibacterial effect.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to reduce the amount of addition to a synthetic resin, and therefore to improve the physical properties of a synthetic resin molded article. An object of the present invention is to provide a synthetic resin composition which does not adversely affect the workability of forming a molded article and has a wide antibacterial and antifungal property.

[0007]

The object of the present invention is to provide polystyrene, polyolefin, polyamide, polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, acrylonitrile ethylene propylene diene styrene copolymer (AES) and acrylonitrile styrene acrylate. This is achieved by providing an antibacterial / antifungal resin composition obtained by adding an antibacterial / antifungal agent having the following composition to a resin selected from the group consisting of copolymer (ASA) and polyoxymethylene. 1.2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine 2.2,4,5,6-tetrachloroisophthalyl 3.1,2-benzisothiazolone 4.2-methoxycarbonylaminobenz Imidazole 5. Diiodomethyl-p-tolylsulfone

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The resin serving as the matrix of the antibacterial and antifungal resin composition of the present invention is polystyrene, polyolefin, polyamide, polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, acrylonitrile ethylene propylene diene styrene copolymer , acrylonitrile styrene acrylate copolymer. It is selected from the group consisting of polymers or polyoxymethylene. The antibacterial / antifungal resin composition of the present invention is characterized by containing a composite antibacterial / antifungal agent having the following composition as an antibacterial / antifungal agent. 1.2,4,5,6-tetrachloroisophthalonitrile 2.2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine 3.1,2-benzisothiazolin-3-one 4. Methyl (benzimidazol-2-yl) carbamate Diiodomethyl-p-tolylsulfone

The proportion of each component used in the antibacterial and antifungal composition used in the present invention is 5 to 40% by weight of 2,4,5,6-tetrachloroisophthalonitrile, preferably 15% by weight.
~ 25% by weight, 2,3,5,6-tetrachloro-4-
(Methylsulfonyl) pyridine is 5 to 40% by weight, preferably 10 to 20% by weight, and 1,2-benzisothiazolin-3-one is 5 to 40% by weight, preferably 10 to 20% by weight.
1 to 20% by weight, preferably 5 to 15% by weight of methyl (benzimidazol-2-yl) carbamate, and 5 to 80% by weight of diiodomethyl-p-tolylsulfone, preferably 30 to 50% by weight. Can be used with The combination of the above antibacterial agents not only complements each other's effects against weaker bacteria in each antibacterial spectrum, but also exerts a stronger antibacterial effect by a synergistic effect. It has a broad antibacterial spectrum, and is effective at a relatively low concentration on many types of molds and bacteria. In addition, the safety to the human body is high,
The effect lasts for a long time because it is hardly eluted by hot water or the like. Further, the antibacterial and antifungal agent of this composition has high heat resistance and is stable even at a high temperature, so that there is no occurrence of deterioration or decomposition due to heating during molding. Furthermore, it is not decomposed by ultraviolet rays, acid alkalis and organic solvents and has high chemical stability.

The composite antibacterial and fungicide used in the antibacterial resin composition of the present invention is used in an amount of 0.005 to 5% by weight, preferably 0.1 to 1.0% by weight, based on the resin composition. If the amount is less than 0.005% by weight, the desired antibacterial and fungicide action cannot be obtained, and if the amount is more than 5% by weight, the physical properties of the resin composition such as discoloration may be impaired. The composite antibacterial and antifungal agent comprising the above five components of the present invention is:
The desired antibacterial and antifungal properties can be obtained by adding a smaller amount of the antibacterial and antifungal agents as compared with the case where a conventional antibacterial and antifungal agent is used.
Therefore, the effect of the antibacterial and fungicide on the resin composition can be minimized. Further, the antibacterial and antifungal resin composition of the present invention contains additives used in combination with the synthetic resin, such as fillers, heat stabilizers, antioxidants, ultraviolet absorbers, plasticizers, coloring agents, and the like. A flame retardant, an antistatic agent and the like can be appropriately added. These can be added at the time of molding. A molded article can be obtained from the antibacterial and antifungal resin composition of the present invention by an injection molding machine, an extrusion molding machine, or the like. It is also possible to mix a resin composition containing no antibacterial and fungicide with a high concentration of the antibacterial and fungicide (master batch method).

[0011]

Example 1 In an air conditioner, an example in which the antibacterial and antifungal resin composition of the present invention is used in an air filter net for collecting dust and fiber debris from the intake air is shown below. Air filter is thickness 3
It consists of a net woven from 00 denier polypropylene yarn and a resin frame. When spinning this net yarn, a 0.5% by weight or 1.0% by weight antibacterial / fungicidal agent having the following composition is added to the polypropylene resin and spun to form a net having an antibacterial / antifungal effect. Produced. The net sample was cut out into a circular shape having a diameter of 27 mm, and was subjected to a mold resistance test (halo test). <Antimicrobial fungicide composition> 2,4,5,6-tetrachloroisophthalonitrile 20% by weight 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine 20% by weight 1,2-benzisothiazoline -3-one 10% by weight methyl (benzimidazol-2-yl) carbamate 10% by weight diiodomethyl-p-tolylsulfone 40% by weight

In the halo test, the initial sample was set at a temperature of 70 ° C.
A sample that had passed for 7 days (sample after heat resistance deterioration) in a state of being kept in water and a sample that had passed for 7 days (sample after water resistance deterioration) in a state of being immersed in running water at 1 liter / minute were subjected to blue mold ( Peni ).
Chillium chrysoginum IAM71
06) was half-embedded in a medium mixed with 25) and cultured at 25 ° C. for 7 days to confirm the formation of a halo (a bacterial growth inhibition zone). Table 1 shows the results.

Table 1

[Table 1]

As can be seen from Table 1, when the antibacterial and antifungal agent of the present invention was added to the filter net material, antibacterial and antifungal properties were recognized, and the antifungal effect was maintained in the sample after the deterioration test. It was confirmed that. On the other hand, although not shown in the table, 1% by weight of the antibacterial and antifungal agent (1) of the present invention was used.
Alternatively, the net added with 0.5% by weight is black mold ( As
pergillus niger IAM2093), Cladosporium clad
osporioides IFO6348) was also confirmed to be effective. Further, regarding the physical properties of the filter net, comparing the net without the antibacterial and fungicide and the net with the antibacterial and fungicide of the present invention,
No substantial difference was found in tensile strength, elongation and shrinkage at 70 ° C.

Example 2 An example is shown in which the antibacterial and antifungal resin composition of the present invention is used for a resin layer covering the surface of a drain pan which receives dew water generated from a heat exchanger of an air conditioner. The drain pan itself is made of polystyrene, but polystyrene has poor oil resistance, so in environments where it is exposed to many oil mist, such as in kitchens and factories that use cutting oil, physical properties may decrease, and the surface of the drain pan may be reduced. Is produced by covering the resin with an oil-resistant resin material such as polyethylene. In addition, the drain pan is a member in which water easily stays, and bacteria and fungi are propagated by using garbage and dust entering the air conditioner as nutrients, and agar-like substances (slime) are easily formed. The drain pan surface was added to a polyethylene resin in the same manner as in Example 1 by adding 1% by weight of the antibacterial and antifungal agent of the present invention to form a film having a thickness of 0.5%.
A drain pan coated with a film having an antibacterial and antifungal effect of 1 mm to prevent the occurrence of slime as described above was produced. Only the film on this surface was peeled off and the diameter 27
It was cut out into a circular shape of mm and was subjected to a mold resistance test (halo test). The hello test was performed with an initial sample and a temperature of 70.
℃ the sample has passed state for 7 days was maintained (sample after heat aging), the running water 1 liter / min sample after lapse of state for 7 days soaked in (sample after water degradation) Penicillium (Fusa
( Rum oxysporum IFO7152) was half-embedded in a medium mixed with the medium and cultured at 25 ° C. for 7 days to confirm the formation of a halo (a bacterial growth inhibition zone). Table 2 shows the results.

Table 2

[Table 2]

As can be seen from Table 2, when the antibacterial and antifungal agent of the present invention was added to the film, the antifungal property was recognized, and the antifungal effect was maintained in the sample after the deterioration test. Was confirmed. On the other hand, although not shown in the table, the film to which 1% by weight of the antibacterial and antifungal agent (1) of the present invention was added was a film of Bacillus subtilis.
It was also confirmed that a halo was similarly observed for IAM1069).

[0018]

As described above, the resin composition of the present invention has good bleed-out of the antibacterial and fungicide from a molded article molded therefrom by combining the resin with an antibacterial and fungicide having a specific composition. It can maintain antibacterial and antifungal properties for a long period of time, and it does not discolor under the influence of ultraviolet rays or heat for a long period of time, so it can be suitably used in places where environmental changes such as air conditioning equipment are severe. In addition, it can be used for peripheral equipment of an air conditioner such as a remote controller.

Continuation of front page (72) Inventor Chikako Ikeda 2-3-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-10-101941 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08

Claims (1)

(57) [Claims] 1. A material selected from the group consisting of polystyrene, polyolefin, polyamide, polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, acrylonitrile ethylene propylene diene styrene copolymer , acrylonitrile styrene acrylate copolymer or polyoxymethylene. An antibacterial / antifungal resin composition obtained by adding an antibacterial / antifungal agent having the following composition to the obtained resin. 1.2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine 2.2,4,5,6-tetrachloroisophthalyl 3.1,2-benzisothiazolone 4.2-methoxycarbonylaminobenz Imidazole 5. Diiodomethyl-p-tolylsulfone