JPS60161904A - Mosquito-repellent incense - Google Patents

Abstract

PURPOSE:A relatively inexpensive mosquito-repellent incense free from an irritating smell and an offensive smell, being fed stably, having improved mechanical molding properties, obtained by using powder of a press molded article of Douglas fir comprising bark and woody part in a specific ratio as a flame-supporting agent. CONSTITUTION:A mosquito-repellent incense blended with Douglas fir powder obtained by crushing a press molded article of Douglas fir comprising 80- 100wt% bark and 20-0wt% woody part of Douglas fir as a supporting agent. The particle size of the powder used is preferably 60 meshes or finer. The amount of the powder blended is preferably 5-50wt% based on the total blended amount. Powder of Douglas fir can be used effectively instead of wood powder, and an amount of wood powder used can be reduced or its use can be eliminated.

Description

[Detailed description of the invention] The present invention relates to a mosquito coil with less irritating odor and foreign odor.

Mosquito coils usually contain combustion supporting agents such as real powder, stem and leaf powder, pyrethrum extract powder, cornstarch, thickeners such as tab powder, fungicides such as dehydroacetic acid, pigments such as mosquito green, pyrethrin, allethrin, An insecticide that is made by uniformly mixing insecticidal active ingredients such as Pinamin Forte, and then adding water and kneading it.
It is manufactured by molding and drying it.

In this case, this powder and pyrethrum extract lees powder are usually used as the combustible agent, but each of these combustible agents has advantages and disadvantages. In other words, this powder is easy to burn and is inexpensive, so it is used in large quantities, but it has the problem of producing a strong pungent odor when burned, and pyrethrum extract lees powder has less pungent odor than this powder. However, since it is an imported product, it is expensive and there are problems with supply stability. In general, the combustion support agent for mosquito coils does not fade when the lI incense is burned, does not produce any irritating odor or off-odor, and has excellent mechanical properties when mixed with glue and water. It is desired to be inexpensive and have a stable supply, and for this reason, there is a demand for a combustion-supporting agent that can overcome the drawbacks of the wood flour and pyrethrum extracted lees powder described above and has excellent properties.

As a result of intensive research into mosquito coils with improved irritating and off-odor properties, the present inventors found that Douglas fir (Douglas fir, Douglas fir, Douglas fir) was used as a combustion support agent in mosquito coils. , a large tree of the Pinaceae family in western North America), whose bark is 80-100% heavy and woody is 20%.
When blending Douglas fir powder obtained by crushing a pressure-molded product of ~0% by weight of Douglas fir, a mosquito coil with less irritating odor and foreign odor can be obtained, and the above powder It is relatively inexpensive, has a stable supply property, has excellent mechanical moldability when mixed with paste and water, and can be used effectively as a substitute for ordinary main powder. can be used,
The inventors have discovered that it is possible to reduce the blended amount of the present powder or eliminate the use of the present powder, leading to the present invention.

The present invention will be explained in more detail below.

The mosquito coil according to the present invention is produced by pressure molding a composition consisting of 80 to 100% (by weight, the same hereinafter) bark of Douglas fir and 20% to 0% woody part of Douglas fir, into pellets, etc. It is made by blending Douglas fir powder obtained by crushing a molded product.

In this case, the above-mentioned molded product may be made of, for example, a composition consisting of 80% or more of Douglas fir bark strips and the remainder consisting of Douglas fir strips of wood.
Those formed into pellets by the method described in Japanese Patent No. 101202 can be suitably used. Here, the amount of Douglas fir bark in the molded product must be 80% or more, and if less than 80% is used, the effect of improving the pungent odor during incense burning will not be sufficient.

Although the particle size of the Douglas fir powder is not necessarily limited, it is preferable to use a particle size of 60 mesh pass or finer than this.

The amount of the Douglas fir powder blended is also not limited, but it is usually 5 to 50% of the total amount of mosquito coil, especially 7 to 35% of the total amount of mosquito coil.
% is preferable.

In addition, in the present invention, the above-mentioned Douglas fir powder alone can be used as a combustion-supporting agent, but the above-mentioned Douglas-fir powder and a known combustion-supporting agent such as ordinary real powder, stem vegetable powder, pyrethrum extracted lees powder, etc. can be used. There is no problem in using them together.

In this case, since Douglas fir powder is blended in the present invention, the amount of this powder can be reduced, and the amount of this powder can be 0 to 30%, particularly 0 to 15%.

Incidentally, the blending amount of the combustion supporting agent containing Douglas fir is usually 60 to 90% of the total amount.

As other components of the present invention, commonly used components can be used. For example, tab powder, corn starch, carboxymethyl cellulose, polyvinyl alcohol, etc. may be blended as a sizing agent in an amount of 10 to 40% of the total amount. In addition, active insecticidal ingredients such as pyrethrin, allethrin, pinamin forte (2), and if necessary, fungicides such as dehydroacetic acid, pigments such as mosquito green, etc. can be added.

The mosquito coil of the present invention can be manufactured by kneading each of the above components with water, molding, and drying according to a conventional method. By blending Douglas fir powder obtained by crushing a pressure-molded product of Douglas fir consisting of 100 ffiffi% and 20 to 0 weight percent woody parts, it has less stinging alI odor and foreign odor. Further, the amount of ordinary wood flour can be reduced, and even when the amount of wood flour m is reduced, it is difficult to cause wiping out.

EXAMPLES Hereinafter, the present invention will be specifically explained by showing Examples and Comparative Examples.

C Examples, Comparative Examples] A mixture containing the bark and woody parts of Douglas fir in the proportions shown in Table 1 was pressure-molded into pellets, and the pressure-molded products were crushed to obtain No. 1 to 4 Douglas fir. Fur powder was obtained.

Next, these powders No. 1 to 4 and other ingredients shown in Table 2 are kneaded with water, and then formed into a spiral shape and dried.
Mosquito coils of Examples 1 to 3, Comparative Examples 1 to 3, and Control Example were obtained.

Next, the following experiment was conducted using the mosquito coils of Examples 1 to 3, Comparative Examples 1 to 3, and Control Example.

[Experiment] Mosquito coils of Examples and Comparative Examples and mosquito coils of Control Example were
After smoking for 1 hour in a closed state using a tatami room (25 m'), a pairwise comparison test was conducted between 10 men and 10 men and 10 men and women to check the irritating odor in the room. Ta.

The results are shown in Table 3.

The evaluation criteria are as follows.

Evaluation Criteria O: Stimulating odor is weaker than the control example △: Equivalent to X: Stronger From the results in Table 3, Examples 1 to 3 used Douglas fir powder containing 80% or more of Douglas fir bark as a combustion suppressant. Mosquito coil No. 3 was less irritating than the control product, and it was found that the irritation was alleviated by blending iζ-grass fir powder with the above properties. In addition, the mosquito coil of Comparative Example 1.2, which uses Douglas fir powder containing less than 80% of Douglas fir bark, and the mosquito coil of Comparative Example 3, which uses white birch bark as a combustion agent, are irritating. It was found that irritation was alleviated by increasing the amount of Douglas fir bark to 80% or more, which was equivalent to the control product.

Applicant: Laion Co., Ltd. Agent: Patent Attorney Takashi Kojima

Claims (1)

[Claims] 1. A Douglas fir powder obtained by crushing a pressure-molded product of Douglas fir consisting of 80 to 10% by weight of Douglas fir bark and 20 to 0% by weight of wood. A mosquito repellent incense that is characterized by the ability to 2. The mosquito coil according to claim 1, wherein the Douglas fir powder has a particle size of 60 mesh or finer. 3. The amount of Douglas fir powder is 5-50% of the total.
The mosquito coil according to claim 1 or 2, which is % by weight.