JPS63160657A - Foam body having deodorizing and antibacterial action - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a foam that has both deodorizing properties and antibiological effects such as antibacterial and antifungal properties, and can be used for multiple purposes.

[Conventional technology]

A patent has recently been published stating that a plastic film containing particles consisting of an iron (II) compound and ascorbic acid has deodorizing properties and can be used for food packaging, etc. (Japanese Patent Laid-Open No. 61-60732). . The above-mentioned publication describes the thickness of 50.
An example of a polypropylene film of m is described.

In the above film, some particles with deodorizing performance are exposed on the film surface, but most of the particles are inside the film, and ammonia etc. are passed through the thin polypropylene layer between the particles and the film surface. It absorbs foul-smelling gases.

On the other hand, regarding thick plastic molded bodies,
No one has yet been known to have deodorizing properties.

However, some plastics emit a unique odor when molded, and there are several proposals for plastics that can remove their own odor. Some plastics emit foul-smelling gases such as ammonia amines during foaming, so odor-free foaming methods are not suitable (some patent applications have been filed (e.g. Japanese Patent Laid-Open No. 59-430)).
Publication No. 37). However, the purpose of these products is to remove the odor from one's own odor, and does not remove odor that comes from other sources.

[Problem that the invention seeks to solve]

In the case of plastic film, its thickness is 10-10
It is about 〇-. On the other hand, ordinary high-foam plastics
The thickness of the cell wall is several orders of magnitude thinner than the thickness of the film.

Therefore, the present inventors believe that if particles with deodorizing performance can be incorporated into highly foamed plastics using an appropriate method, a plastic composition with deodorizing performance can be obtained, and the effect will be greater than that of a film. I thought it might be possible to do this. Also, in the same way,
If particles that have anti-biotic effects such as antibacterial and anti-fungal properties can be incorporated into low-foam plastics, it is possible to obtain a plastic composition that also has anti-biotic effects in addition to the above-mentioned deodorizing performance. be.

In this case, the substance added to the plastic must not impair the physical properties inherent to the plastic, such as strength and color, or affect its foamability. The particles made of the iron(n) compound and ascorbic acid disclosed in JP-A No. 61-60732 mentioned above have no effect on foamability,
If the bioactivity inhibitors were cationic, their efficacy was observed to be affected.

The present inventors succeeded in obtaining the desired foam by using in combination a deodorizer and a substance that inhibits biological activity, both of which are insoluble or sparingly soluble in water.

[Structure of the invention]

That is, the present invention relates to a foam having deodorizing and antibacterial effects, which is characterized by containing a particulate deodorizing agent and an antibacterial agent.

The deodorizing agent used in the present invention is particularly useful as a reactive deodorizing agent, especially a deodorizing agent mainly composed of an inorganic compound, since it has a high reaction rate with malodorous gas. Further, it is preferable that both the deodorizing agent and the antibacterial agent are water-insoluble or sparingly soluble. For example, the deodorizing agent is basic zinc carbonate and ferrous sulfate monohydrate, and the antibacterial agent is N (fluorodichlorochloride). Methylthio)phthalimide is useful.

Both of these deodorizing agents and antibacterial agents are preferably in the form of fine particles, for example, the total particle size is preferably about 30 mesh pass.These deodorizing agents and antibacterial agents are added to foamable plastic raw materials and foamed. The desired foam can be obtained by foam-molding a composition to which necessary raw materials such as agents and fillers are added under almost normal conditions.

The amount of deodorizer added is 100g of solid plastic resin.
The amount of antibacterial agent added is preferably about 0.2 to 2 g. If the amount is less than these, the effect will be small;
Too much content tends to impair foamability and appearance. The foaming ratio usually has little effect if the amount added is within the above range, but
Since it tends to decrease with the amount added, it is best to conduct small-scale preliminary tests before manufacturing.

The foam of the present invention, regardless of whether the cell walls are closed cells or open cells, is effective in removing foul odors from the surrounding area, preventing bacteria, and preventing mold, and the effects are persistent.

〔Effect of the invention〕

The foam having deodorizing and antibacterial effects of the present invention can be used alone or in combination with other materials to produce articles having deodorizing, antibacterial, and antifungal effects.

In particular, it is useful when the foam is made of an elastic material such as polyurethane resin and is highly foamed.

〔Example〕

The present invention will be explained below with reference to Examples, but the present invention is not limited thereto.

Example 1 Basic zinc carbonate (30 mesh baths) was used as a deodorizing agent and N (fluorodichloromethylthio)phthalimide was used as an antibacterial agent. The mixture was mixed with a urethane resin according to the following formulation, and the mixture was cast on release paper and foamed using a dry method. A foamed urethane sheet containing a deodorizing agent and an antibacterial agent was prepared.

Deodorizer 20〃
Antibacterial agent 1
To explain the manufacturing method in detail, the drug with the above composition is mixed with a disper for 30 minutes.
Viscosity 10, QOOcps obtained by stirring for minutes and mixing well
The mixture was cast onto release paper to a thickness of about 0.17III+, preheated at 120°C for 1 minute, and then cured at 130°C for 2 minutes to foam. The finished sheet thickness was 0.5 ms+. The obtained foamed urethane sheet is a closed cell foam.

Separately, a non-foamed urethane film was prepared under the following conditions.

Dimethylformamide 20 # Methyl ethyl ketone 30 150 parts by weight When the above is mixed well, the solid content is 20% and the viscosity is 1500 cp.
This solution was cast onto a release paper to a thickness of 50 μm and dried at 110° C. for 1 minute to obtain a 10 μm thick film.

Next, the surfaces of the foamed urethane sheet and the non-foamed urethane film opposite to the release paper were adhered to each other using an adhesive. The adhesive is polyurethane adhesive (Crisbon 4010
, manufactured by Dainippon Ink & Chemicals (with hardening agent added) was diluted with a solvent (dimethylformamide, ethyl acetate) to reduce the solid content to 4.
After applying it to the top surface of a foamed urethane sheet and drying it (100°C, 1 minute), the films were stacked on top of each other.
After crimping at 100°6140Kg/ca+”, 24
It was left to mature for some time.

The urethane sheet obtained in Example 1 contains about 20 g of basic zinc carbonate and about 1 g of N (fluorodichloromethylthio)phthalimide per IIIz. The deodorizing, antibacterial and antifungal properties of the obtained urethane sheet were measured by the following methods.

Ammonia gas (NH3) ``Initial concentration (co)
6, 31 adjusted to 85-1105pp! Place a sheet piece (size 11cm+ x 18cm+w) in the desiccator.
) and the ammonia gas concentration after 4 hours (C)
was measured and C/C was determined.

Hydrogen sulfide gas (its): initial concentration (Co) 30~
6, 5 adjusted to 40 ppm hydrogen sulfide gas! A sheet piece (size 11c+w x 18cm+) was placed in a desiccator, and the hydrogen sulfide gas concentration (C) was measured after 4 hours to determine C/Co.

Antibacterial properties: using Staphylococcus aureus and Escherichia coli, AATC
The test was conducted according to C test method 100-1981. A 3c+wX3cn+ sheet was used as the sample, and the experiment was repeated three times, and the average value is shown.

Sample sheet 10011I! Pour into a L Erlenmeyer flask,
After sterilization, 0.3 d of the test bacterial solution adjusted to about 1OS/d was added dropwise, and after uniform inoculation, it was cultured in the chamber for 6 hours. After culturing, the viable bacteria in the sample was treated with 0.1% tri ton
After diluting the 0 dispersion in a sterile physiological saline solution containing 100%, it was placed in a petri dish, plated on a tryptone-D agar medium, and cultured at 35°C for 48 hours.

After the cultivation was completed, the number of colonies that appeared in the Petri dish was counted, and the rate of decrease was determined from the separately determined number of viable bacteria immediately after inoculation.

Mold resistance: JIS z2911 mold resistance test method,
According to the test for textile products, Alpergillus flaps ATC
A mold spore suspension of C9643 was spray inoculated onto the sample, and 30
The cells were cultured at ℃ for 4 weeks.

The measurement results are shown in Table 1.

Table 1

Claims (1)

[Scope of Claims] 1. A foam having deodorizing and antibacterial effects, which is characterized by containing a particulate deodorizing agent and an antibacterial agent. 2. The foam having deodorizing and antibacterial effects according to claim 1, wherein the particulate deodorizing agent is basic zinc carbonate or ferrous sulfate monohydrate. 3. A foam having deodorizing and antibacterial effects according to claim 1 or 2, wherein the foam is made of a polyurethane resin.