JP2000302615A - Antibacterial agent and antibacterial resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antibacterial agent safe to an organism, and also not loading to the environment and useful for a cabinet of home electric appliances, or the like, by using slaked lime as a main component. SOLUTION: This antibacterial agent comprises slaked lime as a main component. Preferably, the agent contains 0.1-80 pts.wt. of slaked lime based on 100 pts.wt. of a resin, especially, preferably is used as an antibacterial resin composition containing 0.1-40 pts.wt. of quick lime based on 100 pts.wt. of slaked lime. For instance, the composition may be obtained by blending a synthetic resin such as polyethylene with slaked lime or a mixture of slaked lime and quick lime, and further, the other additive is further added to the blend, as necessary, then blending the resultant mixture in a blender such as a mixing roll, and further kneading the mixture with a twin extruder, or the like, and pelletizing as necessary, and preferably forming a film by a T-die method, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial agent containing slaked lime as a main component and an antibacterial resin composition comprising the resin and the antibacterial agent.

[0002]

2. Description of the Related Art As an antibacterial agent, an organic agent such as TBZ or ZPT or an inorganic antibacterial agent having silver, copper, zinc or the like carried on an inorganic filler such as zeolite, glass or silica is used. However, these antibacterial agents are inadequate in terms of safety to the living body and load on the environment, and are also expensive.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an antibacterial agent which is safe for living bodies and does not impose a load on the environment. The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that slaked lime, which has been conventionally used in large amounts as a food additive or a soil conditioner, has antibacterial properties, leading to the present invention. Was.

[0004]

That is, the present invention relates to an antibacterial agent comprising slaked lime as a main component and an antibacterial resin comprising slaked lime in a ratio of 0.1 to 80 parts by weight with respect to 100 parts by weight of the resin. A composition is provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. Slaked lime [Ca (OH) ₂ ] and quicklime (CaO) used in the present invention are both well-known materials. The main feature of the present invention is to use this slaked lime or slaked lime and quicklime together. That is,
Although slaked lime has excellent antibacterial properties, when kneaded with a synthetic resin, the composition obtained by generating water at 100 ° C. or higher causes foaming, and when this composition is used to form various molded articles, There is a problem that it is difficult to obtain a good molded product.

In the present invention, the above problem has been solved by using quicklime together with slaked lime. In other words, by mixing quicklime with kneaded slaked lime and a synthetic resin, quicklime absorbs water generated from slaked lime, and the quicklime that has absorbed water becomes slaked lime, and the resin composition and the water-based resin composition described above. The problem of foaming of the molded article to be molded is solved.

The preferred amount of quicklime used for slaked lime is 0.1 to 40 parts by weight of quicklime per 100 parts by weight of slaked lime.
Parts by weight, more preferably 1 to 10 parts by weight. If the amount of quicklime used is less than the above range, the problem of foaming due to moisture is difficult to solve, and if it exceeds the above range, there is no particular advantage.

As the synthetic resin used in the present invention, any resin conventionally used for producing various molded articles can be used, and is not particularly limited. For example, PVC
And the like, polyethylene chloride, polystyrene, polyurethane, polyester, polyamide, acrylic resin, ethylene-vinyl acetate copolymer, polyvinyl acetal, polycarbonate and the like.

The antibacterial resin composition of the present invention is produced by heating, melting and mixing a resin and slaked lime according to a conventional method. That is, slaked lime or a mixture of slaked lime and quick lime is blended with the synthetic resin at a ratio of 0.1 to 80% by weight, preferably 5 to 40% by weight with respect to the resin, and other additives are added as necessary. After mixing, this is mixed with a mixing machine such as a mixing roll, a Banbury mixer, a kneader or a Henschel mixer, and further kneaded by a twin-screw extruder or the like, and if necessary, granulated. The film is formed into a packaging material by inflation molding.
In the production of the above resin composition, various additives such as a coloring agent, an ultraviolet absorber, an antioxidant, a plasticizer, a slip agent, an antistatic agent, and an inorganic filler can be appropriately added as necessary. is there.

If the added amount of slaked lime or slaked lime and quick lime is less than the above range, the effect of the present invention is hardly obtained, while if it exceeds the above range, the moldability of the obtained resin composition becomes insufficient, and good physical properties are obtained. Cannot be obtained. Molded articles using the antibacterial resin composition of the present invention are not particularly limited, cabinets for home appliances, shelves and trays for refrigerators,
Foam tray for food packaging, various kitchen utensils (sink mat,
Garbage cans, cutting boards, etc.), buckets, garbage cans, various bath articles (wash basins, floor mats, bath chairs, etc.), pipes, fibers, non-woven fabrics, wire covering materials and the like.

[0011]

Next, the present invention will be described more specifically with reference to examples. Example 1 To 74 parts by weight of a high-density polyethylene resin, 20 parts by weight of slaked lime, 2 parts by weight of quicklime, and 4 parts by weight of calcium stearate were added, and a mixer (trade name: Supermixer SMV-2)
0, manufactured by Kawada Seisakusho) and melt-mixed in a twin-screw extruder adjusted to 180 ° C to obtain a pellet-shaped resin composition. The pellets were formed into a film having a thickness of 50 μm using an inflation extruder. Similarly, a film (control) of a high-density polyethylene resin containing neither slaked lime nor quicklime was prepared.

When the two kinds of films obtained above were subjected to an antibacterial test, the following results were obtained.

[0013]

The antibacterial agent of the present invention is inexpensive, safe for living organisms, and environmentally friendly, and the resin composition containing this antibacterial agent can be used for human touch and fresh food. It is suitable for the production of a large number of molded products, and these molded products have antibacterial properties.

Claims (3)

[Claims] An antibacterial agent comprising slaked lime as a main component. 2. A slaked lime is added to 100 parts by weight of a resin.
An antibacterial resin composition containing 1 to 80 parts by weight. 3. An amount of 0.1 to 4 with respect to 100 parts by weight of slaked lime.
3. The antibacterial resin composition according to claim 2, comprising 0 parts by weight of quicklime.