JPS62360A - Deodorizing filter - 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 [Technical Field] The present invention relates to a deodorizing filter for deodorizing and purifying air.

[Background technology]

Conventionally, air purifiers have been commercially available for the purpose of air purification, and activated carbon filters have been used, and they have been quite effective. However, in the case of activated carbon filters, due to the action of physical adsorption, they not only absorb bad odors, but also water vapor and good odors in the air, and their lifespan is shortened due to the removal of components other than malodorous components. There is. It is insufficiently effective against low molecular weight, low boiling point, hydrophilic gases. In addition, if it becomes saturated, it may re-emit the bad odor, and even now,
It's not something to be satisfied with.

In addition to the above, air purification filters are also used to deodorize by supporting a combination of metal catalysts and metal oxides on a carrier and mainly oxidizing and decomposing bad odors, but some substances are difficult to oxidize. In addition, some metal compounds are unsuitable for use in the home environment because they have a negative effect on the human body (Japanese Patent Application Laid-Open No. 49-131986,
9-131972, JP-A-49-131988).

In order to improve the re-emission properties of activated carbon filters, a filter has been proposed in which a heating element is provided near the filter to incinerate the odor and convert it into oxides (Japanese Patent Application Laid-open No. 130280/1983). However, in addition to the drawbacks such as the need for equipment and the limitations on the places where it can be used, there is also a proposal for a filter that combines calcium hydroxide and calcium sulfate (Japanese Patent Laid-Open No. 51 −
57685), but these filters are
Currently, they are effective against certain odors, but do not have the ability to remove all typical odors that occur in the living environment.

[Purpose of the invention]

The purpose of this invention is to relate to air purifying filters mainly used in air purifiers, etc., and to eliminate bad odors generated in the living environment, especially sulfur-based odors such as ammonia, mercaptans, and hydrogen sulfide. An object of the present invention is to provide a deodorizing filter that is effective against acids.

[Disclosure of the invention]

In order to achieve the above object, the gist of the present invention is a deodorizing filter in which a carrier supports clay minerals.

This will be explained in detail below.

This invention applies clay minerals to various carriers such as paper, woven fabrics, non-woven fabrics, felt, and polyurethane foam, especially those with high cation exchange ability such as kaolinite, sepiolite, illite, montmorillonite, and vermiculite. By dispersing and supporting , it has a deodorizing effect on nitrogen-based odors such as ammonia and amines.

If necessary, to remove sulfur-based and acidic odors,
Ingredients extracted from plants, such as thorn, lilac, holly osmanthus, chinensis, japonica,
One or more plants are selected from a group of plants such as Japanese butterbur, Japanese oak, Quercus persimmonica, Japanese linden, etc., and heat extraction is performed from the plants using a hydrophilic solvent such as water or alcohol. Extract components and further phenolic compounds are added and dispersed.

The extraction method from the plant is not limited as long as it is an extraction method for removing odor components from the raw material plant. For example, a hydrophilic organic solvent such as water, alcohols such as ethanol and methanol, and ketones such as methyl ethyl ketone and acetone is added to the raw material plant mentioned above, and the deodorizing components are thermally extracted using a Soxhlet extractor or the like. . This extraction operation may be performed using a mixed solvent of these hydrophilic organic solvents and water. The extract obtained in this way is usually used as it is, but if necessary, water or a hydrophilic organic solvent is removed by using a rotary evaporator or a vacuum dryer to obtain a deodorizing component as a solid. This solid substance may be used as it is as a deodorant, or may be used after being dissolved in an appropriate solvent. The obtained deodorant can be used alone or in combination. Note that the extraction is not performed in one step as described above, but if necessary, odor components of the raw material plant may be eluted and removed in advance using a hydrophobic organic solvent such as hexane or petroleum ether. Alternatively, a steam distillation method may be used.

Pyrobrol is a phenolic compound.

These include compounds like galifufucic acid, protocatechuic acid, pyrocatechol and hydroquinone.

The method for dispersing the clay mineral into the filter is not particularly limited; for example, in addition to direct injection, the clay mineral may be dispersed by impregnating the filter with a system dispersed in water and then drying it. . In order to improve adhesion to the filter, it may be impregnated with a system mixed with a binder.

Regarding the addition of deodorizers to sulfur and acids, a two-step method may be used in which the above-mentioned filter supported with clay minerals is impregnated with the deodorant, or when the deodorant is in a liquid state, clay minerals are added to the clay mineral. A method may be adopted in which a predetermined amount of minerals are mixed and dispersed in the liquid deodorant, and then the filter is impregnated with the clay mineral and the deodorant at the same time, and there is no particular limitation.

The amount of clay minerals and deodorizers added to the filter is not particularly limited, and the amount of impregnation should be high (within a usable range).
It is desirable to do so.

Next, Examples will be described together with Comparative Examples (Examples 1 to 2. Comparative Example 1) A cellulose nonwoven fabric was impregnated with a 5% aqueous dispersion of vermiculite and montmorillonite Na type clay minerals. Dry. The amount of solid content impregnated was 2 g per 1 d of nonwoven fabric.

The obtained clay-containing nonwoven fabric was cut into 53×5a11 square pieces.
Pour the ammonia gas into a sealable glass container with a volume of Il, and then add ammonia gas until the initial concentration in the container is 1100 pp.
The change in gas concentration within the container was measured over time using a commercially available gas detection tube.

For comparison, 50IX5 was also used for unimpregnated nonwoven fabric.
A similar test was conducted on a C11 square sample.

The results are shown in Figure 1. In the figure, 1 is Comparative Example 1, 2 is Example 1 containing montmorillonite, and 3 is Example 2 containing vermiculite. As can be seen, both clay mineral-containing filters have great deodorizing effects against ammonia.

(Examples 3 to 4. Comparative Example 2) Example 1.
The clay mineral used in -2 was impregnated in the same manner. The amount of impregnated solids is 2/g of polyurethane foam.
．． It was 5g.

Place the obtained polyurethane foam filter in an air purifier, and use the thus prepared filter to
The deodorizing effect of ammonia was investigated when an air purifier was operated in an acrylic box. Note that the air volume is approximately 5001 t/win.

Odor gas was added so that the initial concentration of ammonia was 1100 pp. The deodorizing effect was determined by checking the concentration with a detection tube after adding the odor, then operating the air purifier, measuring the concentration over time, and checking the degree of odor attenuation.

For comparison, unimpregnated polyurethane foam was also measured in the same manner.

The results are shown in FIG. In the figure, 4 indicates Comparative Example 25, Example 3 contains montmorillonite, and 6 indicates Example 4, which contains vermiculite. The system shows great deodorizing effects.

(Example 5) The polyurethane foam impregnated with montmorillonite Na type obtained in the previous Example 1 was drilled.

1% of hot water extracted from holly leaves
It was impregnated with an aqueous solution, dried, and supported. The amount of impregnation was 5 g per 1 g of polyurethane foam. Install this filter in the air purifier and use a 1d acrylic box.
I ran the air purifier and checked its deodorizing effect.

The initial concentration of odor was set to 1100pp for ammonia, 2ppm+ for methyl mercaptan, and 2ppa+ for butyric acid, and as in Examples 3 and 4, the odor concentration in the container was checked over time after the start of operation, and the odor The degree of attenuation was also investigated.

For comparison, the case of only polyurethane foam and the case of Example 3 in which the polyurethane foam was impregnated with only Na-montmorillonite were also investigated.

Note that methyl mercaptan was measured by gas chromatography using an FPD detector, and butyric acid was measured using an FPD detector.
Measured by a detector. The results are shown in FIGS. 3, 4, and 5.

In the figure, the solid line 7 represents Comparative Example 2 containing only urethane foam, the broken line 8 represents Example 5 containing montmorillonite and a plant extract, and the dashed line 9 represents Example 3 containing only montmorillonite. Regarding methyl mercaptan and butyric acid, those impregnated with deodorant are effective, but
It has been found that clay minerals alone are not very effective.
It has been found that in order to develop a deodorizing effect, it is best to impregnate the carrier with a clay mineral and a deodorizing agent that is effective against sulfur and acid systems.

(Example 6) In Example 5, the formulation of the deodorizer added to the filter impregnated with montmorillonite Na type was a mixture of pyrogallol and gallic acid phenolic compounds with extracts of thorn and holly oleander leaves. I made it. The blending ratio was extract:phenol compound=1:1. Other conditions were the same as in Example 5, and the amount of impregnation into the filter was also 5 g per tg of polyurethane foam.

In the same manner as in Example 5, the effects on ammonia, methyl mercaptan, and e71 acid were investigated. Figure 6, Figure 7,
Figure 8 shows the results. As shown in the figure, Example 6 shows great effects on all odors.

〔Effect of the invention〕

Since the present invention has the above-mentioned structure, it was possible to provide a novel deodorizing filter that has a remarkable deodorizing effect on various bad odors generated in the living environment.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 8 are graphs showing the results of tests to confirm the effects of the present invention. Agent Patent Attorney Takehiko Matsumoto Figure 1 Figure 2 Figure 3 Figure 4 Time&”l (Mediator) Figure 5 Time (Mediator) Figure 6 Time (Mediator) Figure 7 Time! I5 (Mediator) ) Figure 8 Dark 1 Vr (intermediate)

Claims (5)

[Claims] (1) A deodorizing filter made of a carrier supporting clay minerals. (2) The deodorizing filter according to claim 1, wherein the clay mineral is at least one selected from the group consisting of kaolinite, sepiolite, illite, montmorillonite, and vermiculite. (3) The deodorizing filter according to claim 1 or 2, to which a deodorizing component extracted from plants is added. (4) Plants include apricot, lilac, holly osmanthus, Chinese forsythia, Japanese azalea, butterbur, mountain oak, quercus,
The deodorizing filter according to any one of claims 1 to 3, which is at least one kind selected from the group consisting of linden tree and persimmon tree. (5) The deodorizing filter according to claim 4, to which a phenolic compound is added.