JPS62359A - Production of 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 method for manufacturing a deodorizing filter for deodorizing and purifying air.

[Background technology]

Conventionally, air purifiers have been commercially available for the purpose of purifying air, and are used with various filters attached. These filters are made by impregnating them with solid substances such as catalysts and activated carbon, as well as with chemicals that have a deodorizing effect.

For example, a carrier such as paper, nonwoven fabric, woven fabric, felt, polyurethane foam, etc. is impregnated with a deodorant whose main ingredients are chemicals such as acids and alkalis, calcium hydroxide, calcium sulfate, and sodium hypochlorite. It is obtained by drying.

[Purpose of the invention]

The purpose of this invention is to provide a method for producing a deodorizing filter that has an improved impregnation operation in order to maximize the deodorizing performance of the deodorant in order to obtain a deodorizing filter that is mainly used in air purifiers. It's about doing.

[Disclosure of the invention]

As a result of our research, we have found that the above objectives can be achieved by adding an anionic surfactant to a liquid deodorant in the process of impregnating a carrier such as a sheet with the deodorant. We have now completed this invention. Therefore, the present invention provides a deodorizing filter characterized in that when a carrier is impregnated with a liquid deodorant to obtain a deodorizing filter, an anionic surfactant is added to the deodorant at the time of impregnation. The gist is the manufacturing method.

This will be explained in detail below.

A deodorizing filter is obtained by impregnating a suitable carrier such as a sheet-like material such as paper, nonwoven fabric, woven fabric, felt, or polyurethane foam with a liquid deodorant.

In this case, due to uneven impregnation into the carrier, local variations occur in the amount of deodorizing agent impregnated, which tends to cause deterioration in the initial performance and durability of the deodorizing filter. Therefore, in the present invention, an appropriate amount (preferably within the range of 0.2 to 5.0% by weight) of an anionic surfactant is added to a liquid deodorant, and the resulting surfactant is The added deodorant is impregnated into the carrier as usual. This improves the uniformity compared to the case where it is not added, and as a result, the deodorizing performance improves.

Note that liquid deodorants are not particularly limited, but include:
It is desirable to dissolve it in a hydrophilic solvent.

The type of anionic surfactant to be used is not limited as long as it enhances permeability or dispersion effect, and examples thereof include sodium alkylnaphthalene sulfonate and sodium alkylbenzene sulfonate.

Examples of deodorizing active ingredients include extracts extracted from plants, such as thorn, lilac, holly osmanthus, chinensis, japonica, butterbur, mountain ash,
Select one or more plants from a group of plants such as Quercus Quercus, Persimmon, and Citrus, and perform thermal extraction from the plant using a hydrophilic solvent such as water or alcohol;
There are extracted components obtained.

The extraction method is not limited as long as it is an extraction method for removing odor components from the raw material plant.

For example, water and ethanol are added to the raw material plants mentioned above.

Adding hydrophilic organic solvents such as alcohols such as methanol and ketones such as methyl ethyl ketone and acetone,
The deodorizing ingredients 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 is used after being dissolved in a suitable solvent.

The obtained deodorant can be used alone or in combination. In addition, the extraction is not a single-stage extraction like this,
If necessary, a hydrophobic organic solvent such as hexane or petroleum ether may be used to elute and remove odor components from the raw material plant in advance. Alternatively, a steam distillation method may be used.

Additionally or separately, pyrogallol,
A liquid deodorant containing a compound such as gallic acid, protocatechuic acid, pyrocatechol or hydroquinone may also be used.

The liquid deodorant is not particularly limited, but if it is added in an amount of 0.2% by weight or more, the uniform impregnation property will be improved, and the deodorizing effect will also be improved.
If it is within 5.0% by weight, problems such as foaming will not occur, so it is preferable to add it as appropriate within this range. More preferably, it is within 3.0% by weight.

Next, examples will be described.

(Examples 1 to 4) 100 g of leaves of Oxalis Oxalis, Ginkgo biloba, Cinnamon biloba, and Oleander holly were collected in an amount of 100 g each, and
Extraction was performed in 00g of hot water at 50°C for 5 hours. After filtering the obtained extract, a 2% by weight aqueous solution was prepared.

To each of the obtained aqueous solutions, sodium alkylnaphthalene sulfonate was added to a concentration of 4000 ppm.

A certain amount of each of the obtained liquid mixtures was impregnated into 10 g of cellulose nonwoven fabric and dried. The impregnated solid content after drying was 0.9 to 1.1 g/Ig of the nonwoven fabric.

For comparison, a sample impregnated with an extract without any surfactant was also prepared. The amount of the extract itself impregnated was the same whether or not a surfactant was added, and the following deodorization evaluation was performed.

Oxalis and ginkgo are effective against nitrogen-based odors, such as ammonia and amines, and Chinese forrest and holly osmanthus are effective against sulfur-based odors.

Therefore, we investigated the deodorizing effect of a nonwoven fabric impregnated with extracts of Oxalis oxalis and Ginkgo biloba leaves against the odor of ammonia. That is, after putting the nonwoven fabric cut into 5CIIX5CDI squares into a 2.51 Erlenmeyer flask and sealing it,
Standard gas of ammonia was introduced into the container using a gas syringe to give an initial concentration of 1100 pp. Thereafter, the odor concentration in the container was measured over time using a commercially available gas detection tube, and the deodorizing effect was examined based on the degree of odor attenuation.

The non-woven fabric impregnated with the extracts of Cinnamon forsythia and Holly osmanthus was cut into 10CIIXIOC11 squares and 2.
After placing it in a 5j2 scale glass container and sealing it tightly, inject the odor of methyl mercaptan with a gas syringe and setting the initial concentration to 2 ppm, measure the odor concentration in the container over time and determine the degree of odor attenuation. The deodorizing effect was investigated by comparing the The odor concentration of methyl mercaptan was determined using gas chromatography and an FPD detector. The results are shown in FIGS. 1 to 4. In the figure, solid lines indicate comparative examples, and broken lines indicate examples. In both cases, it was found that the addition of a surfactant improved the deodorizing effect.

(Example 5) A 2% by weight aqueous solution of the leaf extract of Aspergillus chinensis was prepared, and 11,000 pp of the same surfactant as in Examples 1 to 4 was added.
,,5000ppm, 7500ppm, 1
0,000 ppm, and the obtained blended liquid was impregnated into a 5 cm x 5 aa square polyurethane foam with a thickness of 5 cm and dried to obtain a filter sample.

Each is impregnated with the same amount of solid content as a deodorizing component.

The influence of the different amounts of these four types of surfactants added on the deodorizing effect was investigated using methyl mercaptan as the odor in the same manner as in the previous example. The results are shown in FIG. In the figure, the upper dashed line is 11000ppm, the dashed line is 5000ppm, and the lower dashed line is 7500ppm.
In the case of , the two-dot chain line represents the case of 110,000 pp, and the solid line represents the case without addition of surfactant.

50001) I) If it is R1 or higher, the deodorizing effect will not change much, and of course if there is no additive, 1000
It can be seen that the effect was improved compared to when pp+m was added.

(Example 6) 5,000 pp- of sodium alkylnaphthalene sulfonate was added to a 2% by weight aqueous solution of an extract extracted from Oxalis oleracea, and the extract was impregnated onto a thick polyurethane foam, followed by drying. The impregnation amount was 5 g per Ig of polyurethane foam.

This filter was installed in an air purifier, and the air purifier was operated in an lnf acrylic box to see the deodorizing effect.

For comparison, a case in which no surfactant was added was also investigated.

The initial odor concentration was set to 1100 pp of ammonia, and after the air purifier was operated, the concentration in the container was checked over time using a gas detection tube.

The results are shown in FIG. In the figure, solid lines indicate comparative examples, and broken lines indicate examples. It can be seen that the effect was increased by adding the surfactant.

〔Effect of the invention〕

In this invention, an anionic surfactant is added to a liquid deodorant in a method for producing a deodorizing filter that is impregnated and attached to a carrier, so that the performance of the obtained deodorizing filter can be improved. can.

[Brief explanation of drawings]

Figures 1 to 6 are graphs showing the results of tests conducted to confirm the effects of this invention. Intermediate (Intermediate) Figure 4 Figure 5 Customization (minute) Figure 6 Figure 11 # Listen (#) 1 Kage Suiho Seisho (Autonomy August 23, 1985)

Claims (4)

[Claims] (1) A method for producing a deodorizing filter, which comprises: impregnating a carrier with a liquid deodorant to obtain a deodorant filter, and adding an anionic surfactant to the deodorant at the time of impregnation. (2) The method for producing a deodorizing filter according to claim 1, wherein the carrier is a sheet-like material. (3) The method for producing a deodorizing filter according to claim 1 or 2, wherein the deodorant contains an extract from a plant as an active ingredient. (4) The method for producing a deodorizing filter according to any one of claims 1 to 3, wherein the amount of surfactant added is 0.2 to 5.0% by weight.