JPH1180500A - Anti-bacterial phenolic resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a molding material having enhanced cost/performance by reducing a used amount of a silver-based anti-bacterial agent which is applicable to daily necessities such as lacquer ware, kitchen utensils, etc., and molded items which an unspecified number of the general public may touch, by mixing a phenolic resin containing a specific amount of a phenolic monomer and a dimer and a specific amount of silver-based anti-bacterial agent. SOLUTION: A molding material is obtained by mixing a phenolic resin comprising novolak type phenolic resin and/or a resole-type phenolic resin containing 3-10% in total of a phenolic monomer and a dimer, preferably 2-6% of a phenolic monomer with 0.1-1.0%, preferably 0.2-0.5%, relative to the total of the forming material, of a silver-based anti-bacterial agent having an average particle diameter of 1-100 μm, more preferably 0.1-100 μm. Silver is supported on an inorganic supporter such as silica, aluminum, zeolite and the like for use as the silver-based anti-bacterial agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Phenolic resin molding materials have been widely used in daily life products such as lacquerware and kitchens in terms of heat resistance, moldability, and appearance. These are only available in everyday life, and it is essential that the products possessed by an unspecified number of people have an antibacterial effect. 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 at all manufacturers.

[0003] Phenolic resin is originally used as an antibacterial agent, because the resin itself has an antibacterial action compared to other plastics, but as a cured product, the actual antibacterial effect is not so strong. Rather, it is less effective than other antimicrobial-containing plastics. Accordingly, there has been an increasing demand for a molding material in which a phenol resin is provided with an antibacterial effect. Silver-based antibacterial agents are used in a wide range of fields as inorganic antibacterial agents because of their long-lasting effect, stability, and safety. However, there is a drawback that it is difficult to apply to a product group characterized by cost performance because of its high cost.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lacquer ware by adding only a small amount of an inorganic antibacterial agent to a phenol resin containing a large amount of phenol monomer and dimer.
An object of the present invention is to provide an antibacterial phenolic resin molding material excellent in cost performance which can be applied to a daily life product such as a kitchen or a molded product used by an unspecified number of people.

[0005]

As an antibacterial agent, silica, alumina, zeolite or the like is used as an inorganic carrier, and silver is carried on the inorganic carrier. Average particle size is 0.1-1
A thickness of 00 μm is desirable. It is necessary to uniformly disperse the antibacterial agent in order to uniformly exhibit the antibacterial effect on the surface of the molded article. However, it is preferable to use a larger particle size because the antibacterial effect is reduced and the amount of addition needs to be significantly increased. Absent. Generally, the amount of the silver-based antibacterial agent is 1.
Although it was necessary to add 5% or more, in the present invention, a phenol monomer and a dimer also act as antibacterial agents, so that a sufficient effect can be obtained with an addition amount of about half or less than usual. Preferably, it is 0.2 to 0.5%.

The phenol resin is not particularly limited as long as it contains 3 to 10% of a phenol monomer and a dimer. A novolak type phenol resin, a resol type phenol resin, or the like is used alone or in combination. The phenol monomer and the dimer may be those originally contained in the phenol resin usually used as a raw material, but they may be separately prepared and added when kneading at the time of forming a molding material. Hexamethylenetetramine is used as a curing agent for phenolic resins that do not self-cure at high temperatures of 150C to 190C.

As the base material, an inorganic base material such as calcium carbonate, clay, silica, talc, sepiolite, mica, glass fiber and carbon fiber, and an organic fiber such as wood powder, pulp, plywood powder and crushed cloth may be used as required. Used alone or in combination.

[0008]

The present invention will be described below with reference to examples. Table 1
The mixture was kneaded with a hot roll in the composition shown in Table 1 and pulverized to obtain a phenol resin molding material. In Table 1, the blending ratios indicate weight%.

[0009]

[Table 1]

The antibacterial properties of the moldings obtained from these molding materials were evaluated, and the results shown in Table 2 were obtained. Comparative Examples 1 and 2
Is a case where a phenol resin having a large amount of phenol monomer / dimer and a silver-supported zeolite are used alone. Although the sterilization effect is shown as compared with the blank test of Comparative Example 3, the molded article shown in the Examples shows The antibacterial effect is low in Comparative Examples 1 and 2, since the cells die to the extent that they can be said to be almost nonexistent.

[0011]

[Table 2]

[0012]

EFFECT OF THE INVENTION The phenolic resin molding material of the present invention is obtained by adding a silver-based antibacterial agent to a phenolic resin containing a phenolic monomer and a dimer in an amount larger than usual as a phenolic resin, and for daily life products such as lacquerware and kitchens. Alternatively, it can be suitably used for molded articles that are used by an unspecified number of people.

Claims (3)

[Claims] 1. A silver-based antibacterial agent based on the total weight of a molding material.
A phenol resin molding material containing 1 to 1.0%, and the phenol resin is a phenol resin containing a total of 3 to 10% of a phenol monomer and a dimer. 2. The phenolic resin molding material according to claim 1, wherein the silver-based antibacterial agent has an average particle size of 1 to 100 μm. 3. The phenol resin according to claim 1, wherein the phenol resin contains 2 to 6% of a phenol monomer.
The phenolic resin molding material according to the above.