JP2000279498A - Odor suppression treating agent and treatment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an odor suppression treatment simple by incorporating a catechin compound at specific ppm into an aqueous solution. SOLUTION: The aqueous solution containing the catechin compound at a concentration of 1 to 5000 ppm is used as the odor suppression treating agent. Below this concentration the deodorant effect is not exhibited and above this concentration the performance is saturated and such concentration is uneconomical. The use over 5000 ppm is, however, possible as well. The formulation of the compound in other treating agents is equally well. In the case of, for example, a carbon evaporator, the catechin compound is most preferably formulated into the treating agents for degreasing, pickling, rust preventive treatment, hydrophilicity impartation treatment, etc., when such treatments are carried out. The treatment with the catechin compound-containing treating agent after the end of all the treatment is an equally good alternative. Drying is executed for about 10 to 3600 seconds at about 80 to 200 deg.C after the application of the treating agent although the time varies with the treating agents, treatment methods, the materials to be treated, etc. As a result, the execution of the easy odor suppression treatment by using natural materials is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a treating agent using a natural product having a high odor suppressing effect and a treating method using the same.

[0002]

2. Description of the Related Art Generally, an aluminum alloy is used for a heat exchanger and the like, and this aluminum alloy is subjected to various treatments as a rust preventive.

On the other hand, heat exchangers are generally designed so that the area of the heat exchange portion is as large as possible in order to improve the thermal efficiency, and the fin spacing is generally very small in order to reduce the size. Has become. as a result,
Moisture condenses in the fin gap during heat exchange. Due to this condensed water, microorganisms often propagate in the gaps between the fins, causing an unpleasant odor, and problems have been pointed out by users.

In order to solve such a problem, odor can be effectively suppressed by adding a fungicide or a deodorant to various treating agents, for example, a rust preventive agent.

[0005] However, the antifungal agent and the deodorant generally contain a large amount of synthetic chemicals, and no matter how much they are used, there is no concern about their use. It is also known that the more effects are used, the more the effect is produced. However, such use was impossible due to the cost and the effect on other processing agents.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an odor treatment inhibitor capable of performing odor suppression treatment very easily using natural products.

[0007]

That is, the present invention provides an odor control agent containing a catechin compound in an amount of 1 to 5,000 ppm in an aqueous solution.

Further, the present invention provides a method for treating a substrate after treating it with various treating agents or forming a protective film by applying a paint.
Provided is an odor control treatment method characterized by performing a final treatment with an odor control treatment agent containing a catechin compound in an amount of 1 to 5,000 ppm in an aqueous solution.

[0009]

The catechins are contained in trees, for example, twigs such as tea and persimmon, bark, leaves and the like, and these can be easily extracted from leaves with water. Therefore, the odor control treatment agent of the present invention can be easily extracted from the leaves of such plants, and can be treated only by treating with the extract. In addition, there is no toxicity or other problems at all because it uses naturally occurring substances. In addition, since the treatment is simply performed with an aqueous solution, it is very easy to perform the treatment after forming a protective film on the product and finally.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, a catechin compound is a tree,
For example, it is contained in twigs such as persimmons and teas, bark and leaves, and can be easily obtained by extracting them with water or hot water.

The concentration of the catechin compound is 1 to
It is 5,000 ppm, preferably 10-1,000 ppm.
If the concentration of the catechin compound is less than 1 ppm, the deodorizing effect of the catechin compound cannot be exhibited. On the other hand, 5,000p
Above pm, performance saturates and becomes uneconomical. However, use exceeding 5,000 ppm is also possible.

The above-mentioned odor-suppressing treatment agent can provide its effect even when incorporated in another treatment agent. For example, in the case of a car evaporator, etc., degreasing, pickling, rust prevention treatment, hydrophilic treatment and the like are performed. At this time, the above-mentioned odor suppression treatment agent may be blended in each treatment agent. It is most preferable that the compound be incorporated in the treating agent of the outermost layer, for example, a hydrophilizing treating agent, to obtain the best effect. Alternatively, after all necessary treatments are completed, the treatment may be performed with a treating agent containing the above catechins.

After applying the treating agent of the present invention, drying is performed. Drying varies greatly depending on the treatment agent, treatment method, object to be treated, and the like.
It may be about 600 seconds.

[0014]

It is known that catechins have a deodorizing action and an antibacterial action. When the washing is not performed after the catechin treatment, it is considered that the catechin remaining on the surface of the car evaporator exerts the effect. In addition, it is considered that the cause of the odor of the car evaporator is mainly caused by the odor substance in the air being adsorbed on the surface of the car evaporator, and when the heat is applied, the adsorbed odor substance is simultaneously desorbed. I have. It is thought that the catechin compound blocks the adsorption site on the surface of the car evaporator and suppresses the adsorption of odorous substances.

[0015]

EXAMPLES The present invention will be described in more detail with reference to Examples. The present invention should not be construed as being limited to these examples.

Example 1 A car evaporator subjected to a chromate treatment and a hydrophilization treatment was immersed in pure water containing 10 ppm of catechin, drained, and then dried at 80 ° C. for 600 seconds.

The odor of the obtained car evaporator was evaluated. The evaluation method is as follows.

Evaluation method A car evaporator cut to an appropriate size is treated, and 5
A human panel measured the odor.

Odor Evaluation Criteria Five panelists actually score and score the odor, and give the average score. The evaluation criteria were 5 points: no odor, 4 points: slight odor, 3 points: odor was felt when approaching the nose, 2 points: odor was felt only when there was, and 1 point: strong odor was generated.

In the deterioration test, the car evaporator was immersed in running tap water for 72 hours to be deteriorated. The results are shown in Table 1 for each.

Example 2 A car evaporator, which had been pickled and chromated, was immersed in a hydrophilizing agent containing 100 ppm of catechin (Surfalcoat 860R (main component: polyvinyl alcohol, polyamide and polyvinyl pyrrolidone): manufactured by Nippon Paint Co., Ltd.). After draining well, keep at 180 ° C for 20 minutes.
Dried for seconds.

With respect to the obtained car evaporator, the odor suppressing action was evaluated in the same manner as in Example 1. Table 1 shows the results.

Example 3 An untreated car evaporator was immersed for 30 seconds in a bath heated to 50 ° C. with a one-coat rust preventive / hydrophilizing agent containing 110 ppm of catechin.
For 1800 seconds. One coat rust prevention
The hydrophilizing agent was prepared as follows.

Preparation of treating agent 26.26 g of ammonium zirconium fluoride was added to 300
g of water, and 0.24 g of polyacrylic acid copolymer was added thereto for bath stabilization. Crosslinkable resin (b) separately in advance
A solution prepared by dissolving 20 g of polyvinyl alcohol in 400 g of water was added thereto, and a solution prepared by dissolving 10 g of polyvinylpyrrolidone in 10 g of water and a solution obtained by dissolving 2 g of polyethylene oxide in 8 g of water were further added. Both polyvinylpyrrolidone and polyethylene oxide acted as hydrophilic resins. Nonionic surfactant is contained therein.
25 g (Adecanol SO- commercially available from Asahi Denka Kogyo KK)
145), 0.25 g of an antifoaming agent (Adecanate B-940 obtained from Asahi Denka Kogyo Co., Ltd.) and 3 g of an antibacterial agent (Suraoff 95 obtained from Takeda Pharmaceutical Co., Ltd.) In consideration of the amount, a solution prepared by dissolving an appropriate amount of aluminum nitrate in 50 g of water was added. Make the total amount 950g with water, 10% nitric acid and 10% ammonia water
The pH was adjusted to 3. Finally add water to make the total amount 1000
g.

Except that the baking temperature was set at 100 ° C., the same processing as in Example 1 was performed and a test was performed. Table 1 shows the results.

The same evaluation as in Example 1 was performed for the obtained car evaporator. Table 1 shows the results.

Example 4 Except that the concentration of catechin in Example 3 was changed to 100 ppm,
The same processing was performed and evaluation was performed. Table 1 shows the results.

Example 5 The same procedure as in Example 3 was carried out except that the concentration of catechin in Example 3 was changed to 5,000 ppm, and evaluated. Table 1 shows the results.

Comparative Example 1 The same treatment as in Example 1 was carried out except that the treatment was not carried out with pure water containing catechin. Table 1 shows the results.

Comparative Example 2 Except that the concentration of catechin in Example 3 was 0.1 ppm,
Processing and evaluation were performed similarly. Table 1 shows the results.

Comparative Example 3 Processing and evaluation were performed in the same manner as in Example 3 except that the concentration of catechin in Example 3 was changed to 10,000 ppm. Table 1 shows the results.

[0032]

[Table 1]

Claims (2)

[Claims] 1. The method according to claim 1, wherein the catechin compound is present in an aqueous solution in an amount of 1 to 5.0.
Odor control agent contained in an amount of 00 ppm. 2. An odor control treatment in which a catechin compound is contained in an aqueous solution in an amount of 1 to 5,000 ppm after treating a base material with various treatment agents or forming a protective film by applying a paint. An odor control treatment method, comprising a final treatment with an agent.