JPH03103472A - Foamed or unfoamed plastic molded article having antimicrobial activity - Google Patents

Abstract

PURPOSE:To obtain foamed or unfoamed plastic molded articles having antimicrobial activity for a long period of time and safety, comprising a mixture of borosilicate-based glass carrying Ag2O to produce antimicrobial Ag<+> ion and plastic. CONSTITUTION:A mixture of (A) 1-5 pts.wt. borosilicate-based glass containing 0.2-10wt.% calculated as Ag2O of Ag<+> ion, such as one prepared by adding Ag2O to water-glass and grinding and (B) 100 pts.wt. plastic (polystyrene or phenol resin) selected from thermoplastic resins and thermosetting resins, for example, a plastic molded article prepared by previously producing an equivalent mixture of the components A and B by master batch method, then mixing 100 pts.wt. component B with 2-10 pts.wt. of the equivalent mixture and molding the blend in a foamed or unfoamed state and capable of controlling durability of antimicrobial activity by solubility of glass of the component A.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to antibacterial foam or unexpanded plastic moldings that are safe to the human body, and more particularly, to a dissolution molded article that can control the dissolution time. This is a mixed plastic molded product of a composite resin and a borosilicate glass that supports Ag,0 that generates antibacterial Ag ions on the borosilicate glass. , dried fish, sashimi, etc., when packaged or stored, the plastic molded product has significantly improved antibacterial properties compared to conventional products.

(Prior Art) Products in which antibacterial metals are adsorbed onto porous materials, skeletal structures, etc. have been known, and these are excellent because they have an antibacterial effect.

However, when used for a long time, the effective metal disappears in a short period of time, so there is a problem that it cannot be used repeatedly.

(Problems to be Solved by the Invention) The present invention aims to solve the above-mentioned problems, and specifically aims to propose a plastic body that has antibacterial properties even when used repeatedly.

(Means for Solving the Problems and Their Effects) That is, the present invention has the ability to reduce Ag' ions from 0.2 to IO in terms of Ag2O.
It is characterized in that it contains a mixture of 1 to 5 parts by weight of borosilicate glass and 100 parts of thermoplastic or thermosetting resin.

Further, the structure and operation of the means of the present invention will be explained as follows.

The present inventor proposed that conventional porous materials and framework structures in which antibacterial metals such as Cu and Ag are adsorbed can be used repeatedly because these metals are easily eluted and cannot be used effectively for a long period of time. After investigating a plastic molded product that has antibacterial properties for a long period of time, it was discovered that antibacterial metal oxides supported on borosilicate glass could be mixed or shaped into plastic. . The present invention was established based on this knowledge.

The present invention has an Ag° ion of 0.2 to 1 in terms of Ag2O.
Since it is a molded form in which controlled elution borosilicate glass containing 0% by weight is mixed into plastic, it is possible to freely control the sustainability of antibacterial properties depending on the purpose by changing the solubility of the glass. be.

The borosilicate glass containing 0.2 to 10% Ag' ions in terms of Ag2O used in the present invention is, for example, commercially available water glass (a composition whose main component is Na2O-82O.-Sin2). 'Ion-containing material is added, dried, and ground.

Commercially available plastic is used as the plastic.
Specific examples thereof include thermoplastic resins such as polystyrene, polyethylene, and polypropylene, and thermosetting resins such as phenol resins and melamine resins, but are not limited to these.

There are no particular restrictions on the mixing method as long as it is an appropriate mixing means.

For example, either a masterbatch method or a simultaneous mixing method may be used. From the viewpoint of economy and quality, the former method is preferable. To explain the masterbatch method, a mixture of equal amounts of resin and borosilicate glass is prepared in advance, and 2 to tO parts of this is added to 100 parts of the resin material.

The mixed resin described above is molded in a foamed or unfoamed state. In the case of foaming, foam molding is carried out using a conventional foaming method, while unfoamed products may be molded as they are.

Note that all parts and percentages described in this specification are expressed on a weight basis.

Examples will be explained below.

Example 1 Styrol resin powder 100 parts Butane (blowing agent) 0.5 parts Ag2O-containing borosilicate glass 2 parts The above mixture was thoroughly mixed and shaped by a conventional method.

Example 2 Ethylene resin powder 100 parts Ag2O-containing borosilicate glass 2 parts The above mixture was thoroughly mixed and molded.

Example 3 Resol type phenolic resin powder 100 parts Hexamine powder 5 parts Ag20-containing borosilicate glass powder 1.5 parts The above mixture was thoroughly mixed and molded.

In Examples 1 to 3 described above, when the surface of the molded product was polished using sandpaper #600 or a similar puff, the resin skin layer on the surface was polished and the antibacterial property was improved. do.

When the molded lunch box according to the present invention was repeatedly used 100 times, many fine scratches were generated on the surface, but no rotting of the stored food was observed, and it was found to be very effective from a sanitary standpoint. However, the conventional molded lunch box in which antibacterial Ag2O was adsorbed to a porous skeleton structure was effective until it was used about 20 times, but the effectiveness decreased significantly after that.

(Effects of the Invention) As explained in detail above, the present invention provides a foamed or unfoamed glass made of a mixture of a borosilicate glass supporting Ag' ions in terms of Ag2O and a thermoplastic resin or a thermosetting resin. There is a plastic body. Therefore, the plastic molded article of the present invention has antibacterial properties for a long time and is excellent in practical use.

Claims (1)

[Claims] 1) 0.2 to 1 Ag^+ ion in terms of Ag_2O
A foam having antibacterial properties characterized by being made of a mixture of 1 to 5 parts by weight of borosilicate glass carrying 0% by weight and 100 parts by weight of a plastic selected from thermoplastic resins or thermosetting resins. Or unfoamed plastic moldings.