JPH11189503A - Antimicrobial phenolic resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a phenolic resin molding material which gives excellent antimicrobial and fungicidal effects to daily life goods, e.g. kitchen goods, lacquer wares or the like, and moldings touched by the public in use and lasts the effects. SOLUTION: This antimicrobial phenolic resin molding material comprises the following phenolic compounds as antimicrobial ingredients in an amount of 0.1-1.3 pts.wt. based on the whole molding material. (1) 3-methyl-3- isopropylphenol, (2) 2-isopropyl-5-methylphenol, (3) o-phenylphenol, (4) o- phenylphenol sodium salt, (5) methylphenol, (6) p-chlorophenol, (7) 2,4,6- tribromophenol, (8) 4-chloro-2-(phenylmethyl)phenol, (9) monochloro-2-phenylphenol and (10) 4-chloro-3,5-dimethylphenol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phenolic resin having excellent antibacterial properties, which is used for lacquer ware, kitchen and other daily necessities, or molded articles for use by an unspecified number of people.

[0002]

2. Description of the Related Art Phenolic resin molding materials are widely used in daily life products such as lacquerware and kitchens in terms of heat resistance, moldability and appearance. These are only available in daily life, and it has become essential to exhibit antibacterial action, especially for articles that are held by an unspecified number of people. In addition, in view of the outbreak of food poisoning in the summer of 1996, there is an increasing demand for molding materials having antibacterial properties.

On the other hand, phenolic resin originally has an antibacterial action as compared with other plastics,
Rather, they were sometimes used as antibacterial agents, but the cured ones did not have a strong antibacterial effect, and were less effective than plastics containing other antibacterial compounds. Accordingly, there is a growing demand for a material having an antibacterial effect added to a phenol resin.

In such an antibacterial phenolic resin molding material, fine particles of a single metal or zeolite carrying a metal ion are used as an inorganic antibacterial agent. However, since the fine particles of a metal have a small contact area with bacteria, It is difficult to say that a stable antibacterial effect can be obtained, and in addition, there is a problem that abrasion of a molding machine and a mold and abrasion characteristics of a cured product are large. In the metal ion-supporting zeolite, one cavity for supporting metal ions is provided.
Since it is as small as 0 to 20 μm and it takes time to contact silver ions with bacteria, it takes time to sterilize. In addition, the cavities formed silver compounds having no antibacterial properties from silver ions due to contact with bacteria, and the small cavities closed the cavities, so that there was a difficulty in maintaining the antibacterial activity.

[0005]

As described above, an object of the present invention is to provide a phenol resin by adding an antibacterial agent thereto.
Provide phenolic resin molding materials with excellent antibacterial properties and antifungal properties, and long-lasting effects for molded articles for daily life products such as kitchens and lacquerware, and for use by many unspecified people. It is in. With respect to the antibacterial effect, it was considered that active oxygen was expressed by silver ions, and that the active oxygen destroyed bacterial proteins, and the same effect could be expected with phenolic compounds. Therefore, the present invention imparts antibacterial properties to a phenolic resin molding material by containing a phenolic compound.

[0006]

The present invention is characterized in that an antibacterial phenolic resin molding material contains one or more phenolic compounds of the following (1) to (10) as antibacterial components. The present invention relates to an antibacterial phenolic resin molding material. (1) 3-methyl-3-isopropylphenol,
(2) 2-isopropyl-5-methylphenol,
(3) o-phenylphenol, (4) sodium salt of o-phenylphenol, (5) methylphenol,
(6) p-chlorophenol, (7) 2,4,6-tribromophenol, (8) 4-chloro-2- (phenylmethyl) phenol, (9) monochloro-2-phenylphenol, (10) 4 -Chloro-3,5-dimethylphenol.

Hereinafter, the antibacterial phenol resin molding material of the present invention will be described. The above phenol compounds may be used alone or in combination of two or more. The addition amount of the antibacterial compound is preferably 0.1 to 3 parts by weight based on the whole molding material. If the amount is less than 0.1 part by weight, the antibacterial effect is small, and if it exceeds 3 parts by weight, the effect is not improved and the cost is increased. Phenolic compounds generally have antibacterial properties, but are also highly toxic. Is low. However, according to the study of the present inventors, it has been found that the above-mentioned ten phenol compounds have relatively low toxicity and have a broad antibacterial and antifungal action against bacteria and fungi.

The type of the phenol resin to be used is not particularly limited, and a novolak type phenol resin, a resol type phenol resin or the like is used alone or in combination. 150 ~
Hexamethylenetetramine is used as a curing agent for phenolic resins that do not self-cur at a high temperature of 190 ° C.

Further, regarding the filler, as the organic filler, wood powder, pulp, organic fiber, cloth flakes, thermoplastic resin powder, powder of a cured thermosetting resin, etc. are used depending on the application. I have. On the other hand, in the inorganic filler, calcium carbonate, clay, silica, alumina, aluminum hydroxide, powders such as glass, glass fibers and the like are used, silica, alumina, hard materials such as glass,
There are relatively soft things such as calcium carbonate and clay,
It is selected and used depending on the application and required characteristics. These organic fillers and inorganic fillers are used alone or in combination as needed.

[0010]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Table 1 shows the mixing ratio (parts by weight).

<Example 1> As a resin component, 7 parts by weight of hexamethylenetetramine was added to 43 parts by weight of a phenol novolak resin, and wood flour and calcium carbonate were added as fillers. 2 parts by weight of 3-isopropylphenol was added and kneaded with a heating roll to obtain a phenolic resin molding material. The molding material was subjected to transfer molding to produce a disc-shaped molded article of φ70 × 2 mm.

<Example 2> Example 1 was repeated except that 2 parts by weight of o-phenylphenol was added as an antibacterial compound.
The same method as described above was performed.

<Comparative Example 1> A method similar to that of Example 1 was carried out except that no antibacterial compound was added.

<Comparative Example 2> A blank test was performed in a glass petri dish without using an antibacterial compound.

[0015]

[Table 1]

Molded articles obtained from these molding materials were evaluated for antibacterial properties, antifungal properties and antibacterial retention, and the results shown in Table 2 were obtained. Comparative Example 1 is a general phenolic resin molding material, but showed a sterilization effect of nearly 99% as compared with Comparative Example 2 which was a blank test, but had insufficient antibacterial properties as compared with the molded articles shown in Examples. It is. In the case of the molded article obtained in the example, the mold has recently died and almost no mold has died.

[0017]

[Table 2]

(Measurement method) The test method for antibacterial performance is φ
Escherichia coli was allowed to stand on a 70 × 2 mm disk-shaped molded article using sterile physiological saline as a medium, and the number of viable bacteria immediately after standing and the number of viable bacteria after 24 hours were counted to determine whether or not the cells had died. I saw The test method of antifungal property is φ70 × 2mm
Was transplanted onto the disk-shaped molded product of No. 1, and after one month, whether or not the Aspergillus niger was growing was examined. The test method of the antibacterial durability is to irradiate the molded product with ultraviolet light with a weather meter and to have high humidity (40 ° C, humidity 90%, 1 month)
Then, the molded article was processed (environmental acceleration test) by heating and heating (70 ° C., 1 month), and then the above-mentioned antibacterial test was carried out to determine whether or not the antibacterial property was maintained.

[0019]

As is clear from the above examples, the antibacterial phenolic resin molding material obtained by the present invention is:
Against E. coli, Staphylococcus aureus, Aspergillus, etc.
Has excellent antibacterial and antifungal properties. From this, lacquerware,
It can be suitably used for daily necessities such as kitchens or molded articles touched by an unspecified number of people.

Claims (2)

[Claims] 1. An antimicrobial phenolic resin molding material, which comprises one or more phenolic compounds of the following (1) to (10) as an antimicrobial component: . (1) 3-methyl-3-isopropylphenol,
(2) 2-isopropyl-5-methylphenol,
(3) o-phenylphenol, (4) sodium salt of o-phenylphenol, (5) methylphenol,
(6) p-chlorophenol, (7) 2,4,6-tribromophenol, (8) 4-chloro-2- (phenylmethyl) phenol, (9) monochloro-2-phenylphenol, (10) 4 -Chloro-3,5-dimethylphenol. 2. The antibacterial phenolic resin molding material according to claim 1, wherein the phenolic compound is contained in an amount of 0.1 to 3 parts by weight based on the phenolic resin.