JPH11504022A - Gas permeable pocket containing anti-moth pesticide bearing material - Google Patents

Abstract

  (57) [Summary] The present inventor relates to an anti-moth pad for preventing damage to fabric, comprising a finely divided substrate impregnated with an insecticidally active ingredient in a gas-permeable pocket.

Description

The present invention relates to a product in the form of a pad for use against moths. To repel moths, it is common to use a sheet-like structure based on cellulose, for example paper, which is impregnated with the pesticidal active ingredient. This kind of moth paper is hung on a wardrobe, where the active ingredient is gradually released in a closed space and acts on the moth entering the wardrobe. The disadvantage of this type of paper-like structure is that, on the one hand, the active life of the moth paper is limited, since on the other hand the evaporation rate is very high at the beginning of use according to the initial concentration gradient and flattens over time. In order to guarantee an acceptable active life, the impregnation must be carried out at such a high concentration as to give a multiple overdose until the emitted dose is below the limit of its activity. It has now been proposed, according to the invention, that the carrier material used for the insecticide be a finely divided carrier material with a large surface area for the evaporation of the insecticide, and that it be packaged in a gas-permeable pouch. I do. The present invention therefore relates to an anti-moth pad comprising a finely divided carrier material impregnated with an insecticide in a gas-permeable pouch. The anti-moth pad of the present invention provides a large area for insecticide occupancy, as well as a large evaporative surface of the finely divided carrier material, and, in comparison, the environmentally friendly insecticide in the form of a gas-permeable pouch. Gives a relatively small area for replacement. Pesticides evaporate from the surface of the carrier material particles into the interstitial spaces, which have only a low degree of gas exchange with the environment due to the packing of the particles. The rate of evaporation is limited by the saturation of the space between the particles with the evaporating insecticide, and the initial overdose observed with moth paper in sheet form does not occur. Thus, the pile-moth pad of the present invention achieves a very uniform release of the active ingredient over a very long period. The anti-moth pad of the present invention is preferably hung on a clothes rail between clothing items in a wardrobe. Thus, a further advantage of the anti-moth pad of the present invention is that the anti-moth pad is highly saturated with the active ingredient when the anti-moth pad moves, for example, when clothing is removed or hung up. The exchange between the atmosphere and the environment is to increase. In this way, a temporary shortage of the insecticidal active ingredient in the wardrobe is compensated by gas exchange each time it is opened. Suitable finely divided carrier materials are, for example, the organic and inorganic carrier materials mentioned, for example, in EP-B 279 325, page 5, lines 55-59, such as kaolin, argillaceous earth, talc, chalk. , Quartz, attapulgite, montmorillonite, diatomaceous earth, highly dispersed silica, alumina, silicate, calcite, marble, pumice, sepiolite, dolomite, sawdust, coconut shell, corn chunks and tobacco stems. The particle size of the carrier material is preferably in the range of 0.1 to 2 mm. Particularly preferred is a range of 3 to 1.5 mm. Swellable natural and synthetic inorganic materials, known as slow-release compositions, for example as disclosed in EP-B 90992 and EP-A 541 358, having a mainly layered lattice structure, are also suitable. Suitable pesticidally active ingredients have a sufficiently high vapor pressure at room temperature, such as phosphates: dichlorvos (DDVP), fenitrothion, malathion, chlorpyrifol, diazinon, methylpyrimifos; carbamates: propoxur, carbofuran And carbaryl and benzylcarb; and pyrethroids: cyfluthulin, tetramethrin, allethrin, baporsurin, tetraresulin, bioresmethrin, esviol, cypermethrin, alphamethrin, desis, permethrin, transfluthrin and combinations thereof. A particularly preferred active ingredient is transfluthrin, which has a vapor pressure at 20 ° C. of about 4 · 10 ⁻⁶ mbar. Particularly preferred carrier materials are cellulose-based carrier materials, such as cotton in the form of cotton wool or folded cotton cloth, ripped-up paper and the like. Particularly preferred is wood floor as used in the paper industry. Particularly suitable cloth bags are those made from woven fabrics, gauze or non-woven paper. To produce the moth pad of the present invention, the carrier material is impregnated with the active ingredient, preferably as a solution in a solvent, and then used to fill a suitable pouch, which is subsequently stitched or glued. Close by gluing. Suitable solvents are alcohols such as ethanol, propanol and isopropanol, ethylene glycol ethers such as ethylene glycol butyl ether; and propylene glycol ethers such as propylene glycol butyl ether; and also ketones such as acetone; higher ketones such as methyl ethyl ketone and Methyl isobutyl ketone. In order to better monitor the uniformity of application of the active ingredient to the carrier material, the solution of the active ingredient can be colored with a suitable dye. A suitable example is Sudan Blue 670, which is available from BASF AG, Ludwigs hafen. Furthermore, it is possible to introduce the solution of the active ingredient into the sealed pouch containing the carrier material, subsequently using, for example, a syringe. Finally, the solution of the active ingredient can also be applied from the outside of the pouch, where the solution is hermetically packaged and then distributed during normal transport and storage periods. A preferred carrier material according to the present invention is wood flour. Preferred types of wood flour are those types available especially for use in the paper industry. However, the commonly available form of wood flour has been found to be a suitable carrier material only when isopropanol is used as the solvent. After overnight treatment in a drying oven at 120 ° C., significant success against moths is achieved with other solvents as well. The effect can be attributed to the moisture content of the wood flour. Due to the interaction of water with a range of solvents, wood flour tends to swell very much, during which time the active ingredients dissolved in the solvent can be sealed in the wood flour and evaporate from the wood flour surface It seems to be gone. The use of wood flour as carrier material therefore requires pre-drying the wood flour to a moisture content of preferably less than 2%, particularly preferably less than 0.5%. However, according to the invention, the wood flour is preferably used in combination with isopropanol as solvent for the active ingredient, which in this case has a water content of 15 to 20% by weight which is normally present in the wood flour in the feed form Does not reduce the activity of the moth pad of the present invention. According to the present invention, may be in the application rate of transfluthrin in wardrobes volume 1 m ³ per 40~100mg per year to ensure freedom from clothing pests. In this connection, the surface area of the gas permeable pouch of the moth pad through which the active ingredient is released into the atmosphere in the wardrobe must be about 40-70 cm ² per m ^{3 of} wardrobe volume . Depending on the activity and vapor pressure of the active ingredient at ambient temperature, the parameters for moth pads for other active ingredients may be different. The atmosphere in the interstices of the carrier particles remains substantially homogeneously saturated until the active ingredient is almost completely consumed, and the release of the active ingredient through the pouch also remains approximately constant . Example It was wood flour available under the name LIGNOCELL ^R 5 from the company. Wood flour has a particle size distribution of 97% by weight for <1.5mm and 3% for <0.6mm. In its feed form, the wood flour has a moisture content of about 17% by weight. A 6 g portion was weighed out. Several portions of the wood flour were dried to a residual moisture content of less than 0.5% by weight each. A solution of the active ingredient was prepared in each case using 10.6% by weight of transfluthrin and the solvents acetone, propylene glycol n-butyl ether (PnB) and isopropanol, respectively. 0.24 ml of the active ingredient solution was allocated to each piece of wood flour and mixed intimately with it. The gauze pouch was then filled with the small portion and the pouch was closed. The test animals used for the activity test were clothes moth, the larva L _2-3 of Tineola bisselliella and the larva L _{3- of} fur insects and Attagenus piceus. It was ₆ . The test environment used includes a test chamber having dimensions of 625 mm deep, 523 mm wide and 1699 mm high corresponding to a volume of 0.555 m ³ . In the middle of its vertical length, the chests are separated by plates in such a way that an elongated hole 180 mm wide allows air exchange between the upper and lower halves. A rail is provided 30 mm below the top of the chest, at the center of the opening and parallel to it, on which a clothes hanger can be hung. One moth pad was suspended at the center of each rail. To the left and right of the moth pad, the fabric was hung on a clothes hanger in such a way that it did not come into contact with the moth pad. The garment is a wool garment of fabric color (100% wool). As a standard, one chest was assembled without a moth pad. One week after hanging the moth pad and at intervals of one week or more thereafter-as shown in the table below-the test animal is placed on a piece of cloth measuring 5 x 5 cm and placed in the middle of the chest. Placed on a plate of height. Turtle larvae and fur insect larvae were evaluated for knockdown effects, and the fabric was evaluated for the areas or holes it devoured. The results are shown in the table below.

────────────────────────────────────────────────── ─── Continuation of front page    (81) Designated countries EP (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, L U, MC, NL, PT, SE), OA (BF, BJ, CF) , CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG), AU, BB, BG, BR, BY, CA, CN, CZ, HU, JP, KR, KZ, LK, M X, NO, NZ, PL, RO, RU, SK, UA, US

Claims (1)

[Claims] 1. Gas - a permeable pouch, it comprises a carrier material having a specific surface area of 0.05~10cm ² / g insecticide impregnated, anti insecticidally active ingredient having a vapor pressure of at least 10 ^-6 mbar - Moth pad. 2. The anti-moth pad according to claim 1, wherein wood powder is used as the carrier material. 3. The anti-moth pad according to claim 1 or 2, wherein transfluthrin is used as the insecticidal active ingredient. 4. impregnating a carrier material having a specific surface area of 0.05 to 10 cm ² / g with a solution of the pesticidal active ingredient having a vapor pressure of at least 10 ⁻⁶ mbar and using the impregnated carrier material to perform gas- 4. The method as claimed in claim 1, wherein the pouch is filled with a permeable pouch and the gas-permeable pouch is closed. 5. Filling the gas-permeable pouch with a carrier material having a specific surface area of 0.05 to 10 cm ² / g, closing the pouch and impregnating the carrier material with a solution of the pesticidal active ingredient. A method for producing an anti-moth pad according to one of claims 1 to 3. 6. 6. The process according to claim 4, wherein wood powder is used as the carrier material and isopropanol is used as the solvent for the pesticidal active ingredient. 6. The process as claimed in claim 4, wherein a wood flour having a residual moisture content of less than 7.2% by weight is used as the carrier material.