JPH10259291A - Phenolic resin molding material and molded part therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a phenolic resin excellent in an antibacterial property in addition to the characteristics of a conventional phenolic resin molding material and good in balance between characteristics, and a molded material part therefrom. SOLUTION: This phenolic resin molding material is obtained by containing a phenolic resin and an antibacterial agent attached to a carrier, obtained by attaching an antibacterial silver compound such as silver chloride on carrier particles of a physiologically inactive synthetic oxide, e.g. titanium dioxide as indispensable components in a ratio of 0.1-10wt.% antibacterial agent attached to the carrier based on the total weight of the molding material, and a phenolic resin molded material part is formed by molding the same material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a phenolic resin molding material having excellent antibacterial properties and a molded part thereof.

[0002]

2. Description of the Related Art Hitherto, phenol resins have been widely used as molding materials by kneading with base materials, plasticizers, coloring agents, release agents, and the like. The usage ratio in the field of food and tableware is also increasing.

In recent years, in the field of kitchen products, there has been a demand for the development of a phenol resin molding material having excellent antibacterial properties for sanitary reasons.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a phenolic resin having excellent antibacterial properties in addition to the properties of a conventional phenolic resin molding material, and having a well-balanced property and its molding. It is intended to provide parts.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above-mentioned object, and as a result, the use of a phenolic resin and carrier particles having an antibacterial silver compound adhered thereto has led to the aforementioned object. Have been achieved, and the present invention has been completed.

That is, the present invention comprises a phenolic resin and an antibacterial agent with a carrier in which an antibacterial silver compound is adhered to carrier particles of a physiologically inert synthetic oxide, as essential components. A phenolic resin molding material characterized by containing the antibacterial agent with a carrier in a ratio of 0.1 to 10% by weight, and a phenolic resin molded part characterized by being molded.

Hereinafter, the present invention will be described in detail.

The phenolic resin used in the present invention includes:
Phenols such as phenol and cresol, or molasses, lignin, xylene, naphthalene, modified phenols by petroleum aromatic hydrocarbons, and formalin and paraformaldehyde were mixed at an appropriate molar ratio and reacted under a catalyst. Novolak-type phenol resins, resol-type phenol resins, and combinations of novolak-type phenol resins and resol-type phenol resins are exemplified.

The physiologically inactive synthetic oxide in the antibacterial agent with a carrier used in the present invention includes oxides of titanium, magnesium, aluminum, silicon, cerium, zirconium, hafnium, niobium and tartan, calcium, hydroxyapatite, Barium sulfate and the like are mentioned, and titanium dioxide is preferable. The particle size is preferably smaller than 25 μm, more preferably 1 μm.
1515 μm. Further, the structure is preferably in a form that is porous, and the surface area is 1 to 240 m ² / g,
Preferably, it is in the range of 5 to 100 m ² / g.

The antibacterial silver compound used in the present invention includes:
Silver chloride is preferred, and physiologically inert synthetic oxides 1 to
It may be present at 75% by weight, preferably 10-60% by weight.

The compounding ratio of the antibacterial agent with a carrier is desirably 0.1 to 10% by weight based on the whole molding material. If the proportion is less than 0.1% by weight, there is no antibacterial effect, and
Exceeding the percentage by weight impairs the excellent properties of the phenolic resin molding material and is not preferred.

The phenolic resin molding material of the present invention comprises a phenolic resin and an antibacterial agent with a carrier obtained by adhering an antibacterial silver compound to physiologically inert synthetic oxide carrier particles. To the extent not contrary to purpose,
If necessary, for example, natural waxes, synthetic waxes, metal salts of straight-chain fatty acids, acid amides, esters,
A release agent such as paraffin, a curing agent such as hexamethylenetetramine, and various curing accelerators can be appropriately added and blended.

The phenolic resin molding material of the present invention can be usually produced as follows. After mixing and uniformly dispersing a phenolic resin, a predetermined amount of an antibacterial agent with a carrier and, if necessary, a curing agent, a coloring agent, a curing accelerator, a flame retardant, a release agent, a coupling agent, and a plasticizer, The mixture is heated and kneaded by a kneader, then solidified by cooling, and pulverized to an appropriate size by a pulverizer to obtain a phenol resin molding material. Also,
This phenolic resin molding material can be molded into a molded part by a conventional method.

[0014]

According to the present invention, the heat resistance, mechanical properties, workability and electrical properties of a phenolic resin molding material can be maintained by adding a specific antibacterial agent with a carrier to the phenolic resin. A phenolic resin molding material having antibacterial properties and a molded part thereof were obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to examples, but the present invention is not limited to these examples. "%" In the following Examples and Comparative Examples
"" Means "% by weight".

Example Novolak type phenolic resin 50%, hexamethylenetetramine 7%, calcium carbonate 10%, wood powder 25%, antibacterial agent with carrier (30% silver chloride adhered to titanium dioxide powder) 0.7 % And other additives 7.3% were mixed at room temperature, kneaded at 90-110 ° C., cooled and pulverized to produce a phenolic resin molding material.

Comparative Example 50% of novolak type phenol resin, 7% of hexamethylenetetramine, 10.7% of calcium carbonate, 25% of wood flour, and 7.3% of other additives were mixed at room temperature, kneaded at 90 to 110 ° C. and cooled. Then, it was pulverized to produce a phenolic resin molding material.

The phenolic resin molding materials produced in Examples and Comparative Examples were molded and cured in a mold heated to 170 ° C. by injection molding to obtain molded parts. The resulting molded parts were tested for antibacterial properties, heat distortion temperature, mechanical properties, electrical properties, and moldability. The results are shown in Table 1. The present invention is excellent in various properties. In addition, it showed well-balanced characteristics, and the effect of the present invention could be confirmed.

[0019]

[Table 1] * 1: A few drops of a dilution medium mixed with bacteria were placed on a plate-shaped molded part, cultured, and the viable cell count was confirmed 24 hours later. (Bacterial count at start: 1.0 × 10 ³ cells)

[0020]

As is clear from the above description and the table of the test results, the phenolic resin molding material of the present invention and the molded part thereof maintain the characteristics of the conventional member and have antibacterial properties. In particular, it is suitable as a kitchen article or the like.

Claims (2)

[Claims] 1. An essential component comprising a phenolic resin and an antibacterial agent with a carrier obtained by adhering an antibacterial silver compound to carrier particles of a physiologically inert synthetic oxide. A phenolic resin molding material containing an antibacterial agent in a ratio of 0.1 to 10% by weight. 2. An essential component comprising a phenolic resin and an antibacterial agent with a carrier obtained by adhering an antibacterial silver compound to carrier particles of a physiologically inactive synthetic oxide. A phenolic resin molded part formed by molding with a phenolic resin molding material containing an antibacterial agent in a ratio of 0.1 to 10% by weight.