JPH0241498A - Insect-proof sheet - Google Patents

Abstract

PURPOSE:To provide the title sheet excellent in insect-proof activity, useful for clothing storage by being spread on the bottom of drawers of wardrobes or for cockroach-proofing by the use in sideboards, incorporated with an extract from Ginkgo biloba or Ginkgo biloba powder. CONSTITUTION:Ginkgo biloba (pref. leaves thereof) is extracted with an organic solvent such as an ether, halogenated hydrocarbon, ester, ketone or alcohol, and the resulting liquid extract is then freed from the solvent to obtain an extract. The objective sheet can be obtained by incorporating a base sheet with said extract or Ginkgo biloba powder. The amount of Ginkgo bilaba to be used is pref. such as to be, based on the paper, >=0.01wt.% for the extract or 0.05wt.% for the powder.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an insect repellent sheet characterized by containing Gulbus extract or Gulbus powder, which can be used as a pest control sheet for houses, clothing, and gardening. .

(Prior art and problems to be solved) Insect-proof sheets are currently used in various fields. For example, for houses, it is used as an underlay for tatami mats and carpets, and as an underlay for dishes in cupboards.For clothing, tatami paper is used, and recently there are costume boxes made of insect-proof sheets. These insect repellent sheets target sanitary pests and clothing pests such as fleas, lice, mites, bed bugs, and cockroaches, and contain organic phosphorus agents such as Balajichlorobenzene, naphthalene, DDVP, and lindane as insect repellent agents. Non-volatile pyrethroid insecticides have been selected and used depending on the purpose. However, all of these are highly toxic; for example, in the case of DDVP, LD50:32 when administered orally to rats.
mg/kg of toxicity and is not recommended for use in general households, especially in areas related to dietary habits, such as protecting food or placing under tableware. Additionally, naphthalene, camphor, and the like have a problem of strong odor.

(Means for Solving the Problems) In order to obtain an insect repellent sheet with high insect repellent activity and high safety against vertebrates, the present inventor has been searching for various plants, focusing on the insect repellent effect of plants. . In other words, plants produce a wide variety of secondary metabolites in order to protect themselves from external enemies, but among these, plants that are not easily affected by external enemies have a repellent effect on pests and other harmful organisms. It is possible that it contains substances that cause this. Moreover, since the repellent substances produced by plants are natural substances, they are highly safe and can be expected to be used as medicines that will not disrupt the balance of the ecosystem. Based on this idea, we conducted research on plants that exhibit significant feeding damage resistance against pests, and as a result, we discovered that sheets containing Gypsophila extract or Gypsophila powder have pest repellent activity, which led to the completion of the present invention. It's arrived. That is, the insect repellent sheet according to the present invention contains as an active ingredient an extract from the Japanese yam or a powdered yam.

Although any part of the tree can be used in the present invention, such as the leaves of the Japanese yam, the xylem and two seeds, it is convenient to use the leaves of the yam because of its ease of collection. Extraction is performed using organic solvents such as ethers, halogenated carbons, esters, ketones, and alcohols. The extract obtained by concentrating the extraction solution and removing the solvent is a viscous substance with a dark green to ocher color. If the color of this extract is inappropriate for the insect repellent sheet of the present invention, the extract solution may be slightly decolored with activated carbon or the like, without losing the insect repellent effect. When using, for example, fig leaf powder in the present invention, the fig leaves may be directly dried or dried by heating, and a granulating agent or the like may be added and pulverized.

Sheets that serve as carriers include wood, chips, paper, nonwoven fabrics, and textiles2.
Any material such as a synthetic resin foam sheet may be used, and it can be selected depending on the intended use of the insect repellent sheet of the present invention. Various methods can be considered for impregnating and attaching Gypsophila depending on the type of sheet used as a carrier and the extract or powder of Gypsophila. The simplest method is, for example, to dissolve the Gypsophila extract in a suitable solvent and immerse a carrier sheet such as paper, nonwoven fabric, or textile in the solution, or to uniformly spray the Gypsophila extract solution onto these sheets. In the case of plastic sheets, etc., a method of kneading Gypsophila extract or powder may also be considered. In addition, adhesive is applied to each sheet,
It is also possible to sprinkle the fig powder or cover it with another sheet to form a sandwich of fig powder.

In the case of an extract, the amount of Gypsophila to be used is based on the weight of the paper.
0.001% or more, preferably 0.01% or more, and in the case of powder, 0.005% or more, preferably 0.005% or more, based on the paper weight.
0.05% or more is good. It is more effective to treat the staghorn so that it is present on or as close to the surface of the paper as possible.

Next, the present invention will be explained in more detail using Examples and Test Examples.

(Examples and Test Examples) Example 1 [Extraction of Active Ingredients] 100 g of Gypsophila leaves were heated under reflux in 500 ml of methanol for 1 hour, and the methanol extract obtained by filtering the seed residue was concentrated to remove the solvent. Glucose leaf extract 20
I got g.

[Manufacture of Insect-Repellent Paper] 4 mg of the obtained fig leaves were dissolved in 10 ml of ether. The entire ethereal solution of Gypsophila extract was evenly sprayed onto a 20 cm x 30 cm kraft paper (4 g).

The ether was completely removed by air drying to obtain insect-proof kraft paper.

Test Example 1 The insect-proof kraft paper produced in Example 1 was cut into 5 cm x 5 cm pieces, and a small piece of carpet of the same size was placed on top of it. As a control, another small piece of carpet of the same size was prepared and placed 5 cm apart in the center of the bottom of a 20 cm x 20 cm x 5 cm (height) plastic container. Ryoryoku - Drop about 50 woolly mites on each small piece of PET, and place black light-shielding paper (20cm x 20cm) on top of it.
) was placed.

After standing at about 26°C for 20 hours, a small piece of each carpet was taken out and placed on a heating plate at about 60°C, and the number of mites that escaped was counted. As a result, the number of living mites in the carpet piece on the insect repellent kraft paper of the present invention was 3, and the number of living mites in the target carpet piece was 90 or more.

Test Example 2 The insect repellent kraft paper (diameter ioam) prepared in Example 1 was placed on the bottom of a cup made of solar plastic with a lid of about IL, and a muslin cloth of the same size was placed on top of it. As a control, containers without insect-proof kraft paper were prepared, and 10 adult burr larvae were placed in each of both plastic containers. the result,
The bur larvae in the plastic container containing insect-proof kraft paper were completely dead after 3 days, but all the bur larvae in the control container were alive after 3 days.

(Effects of the Invention) As shown in the above test examples, the insect repellent sheet obtained by the present invention had very excellent insect repellent activity.

The insect repellent sheet of the present invention can be used for clothing by placing it on the bottom of a drawer for Western or Japanese dance, or by wrapping clothing for two dolls, hangers, etc. Furthermore, paper dolls and hanging scrolls may be made using the insect repellent paper of the present invention. In addition, for household use, when used as a sheet under dishes in cupboards, it not only has an insect repellent effect against cockroaches, but also keeps away flies. For horticultural purposes, it can also be used to provide insect repellency to newsprint, hatron paper, paraffin paper, etc. that protect fruits. Moreover, the Gypsophila extract does not exhibit toxicity even at 5 g/kg when administered orally to rats, has low toxicity to fish and birds, and has no mutagenicity or contact toxicity. Also,
There is no irritating odor.

In this way, Gypsophila extract is an excellent adhesive for sheets that is highly safe and has no odor problems, so sheets attached with it can be used safely in areas related to dietary habits, such as kitchens. It is something.

Claims (1)

[Claims] An insect repellent sheet containing Ginkgo biloba extract or Ginkgo biloba powder