HU193204B - Retarde insectifuge /insecticide/ composition - Google Patents

Abstract

SUMMARY OF THE INVENTION \ t containing a pyrethrin derivative. It has a long lasting insecticidal effect to the pyrethrin derivative with silicone oil dissolved in a solvent in which both are soluble, e.g. trichloroethane. The solution has porous surfaces watered and then dried. ACTIVITY ACTION material is released into the air by evaporation with electric power. The applied silicone oil provides that the pyrethrin derivative is not oxidized, it also provides uniform tension and that the active ingredient is optimal achieve insecticidal action.

Description

Insecticides have long been used in various forms. Insects, especially mosquitoes, cause their skin to bump and swell for days. Initially, on the assumption that it was caused by acids penetrated through the skin during the tweezing, it was attempted to be treated with ammonia. It is now known that toxin albumin, which acts as a foreign protein in humans and produces an allergic effect, is the cause of this effect. The itching effect is caused by the production of histamine at the site of the puncture, which the body defends against ingested foreign matter and renders it harmless.

Older insecticides were almost exclusively based on fragrance (eucalyptus, citronella, clove, etc. oil). They are available in the form of an oil, an alcoholic solution or an emulsion. However, the strong scent was unpleasant not only for the insect but also for man. Later, during the Second World War, especially in the jungle wars, dimethylphthalate-based insecticides became widespread, which, on the one hand, proved to be effective because of their pungent taste and, on the other hand, because of their vapor strain. Similar agents were dimethatholamide, ethylhexanediol (2-ethylhexanediol 13) and indalone (αα-dimethyl-α-cerbuto.xidihydro-pyrone). These substances were also marketed in that form. Plastic plasticizers have a similar effect.

A group of insecticides, such as pyrethrin derivatives, also have insecticidal and insecticidal activity. The composition also depends on the efficacy against each species of insect. A solution of such compositions is sprayed or sprayed from an aerosol can into the air by spraying with carrier gas. In this case, the insects that are already present, because they act as nerve poisons, will be killed or a short-term alarming effect will occur. Because the insecticide effect is very short, spraying should be repeated frequently if there is a persistent insect hazard.

Of course, any insecticide or pesticide must be effective so that it cannot be harmful to the human body or irritate the skin.

SUMMARY OF THE INVENTION The present invention is directed to an insecticide which contains a pyrethrin derivative and achieves a sustained action by applying a solution to a porous surface shovel and transferring the active ingredient to the atmosphere by means of an evaporator. The substance is harmless to the human body.

The pyrethrin derivative may be natural or synthetic. Examples include chrysanthene (2,2-dimethyl-3 (2-methyl-1-propenyl), cyclopropanecarboxylic acid, or permethric acid, 3- (2,2-dichloro-vinyl) -2,2-dimethyl-1-cyclopropanecarboxylic acid, e.g. Esters of m-phenoxybenzyl alcohol 2

obsession

R = COOCH ₃

Or it could be eg. Esters and derivatives of pyrethric acid (2-methoxycarbonyl-1-propenyl) -2,2-dimethyl-1-cyclopropanecarboxylic acid

A solution of these derivatives is applied to a suitably prepared fibrous substrate (e.g., fibrous paper asbestos, filter plate, or appropriate large-area fibrous sheet).

However, pyrethrin and its derivatives are oxidized relatively quickly. This also exists in aerosol form, but is more pronounced when the active ingredient is introduced into the atmosphere by evaporation. To counteract this, they are combined with other longer-acting insecticides (such as HCH). They also use antioxidants such as antioxidants. tributin, etc.

USP 4 210642 (No. ₃ A 01N / 9136) also describes a solution consisting of a two-component active ingredient applied to a carrier; which have a synergistic effect. One component is an endosulfone compound and the other is a substance close to the pyrethrin structure. However, these solutions do not solve the problem that the change of tension over the surface of the sheet is also large and do not ensure even long-term evaporation.

Therefore, the present invention provides a solution in which a single substance used in a pyrethrin derivative ensures that the pyrethrin derivative is not oxidized, i.e., an antioxidant, stays stable and evaporates uniformly over a long period of time (depending on air space) for 18-24 hours. ; and provide optimum insect repellency in airspace.

For this purpose, a silicone oil of methyl or methylphenyl type having a viscosity of 100 to 500 mPa was used.

Evaporation is accomplished by using a specially designed electric power device-2193204, which operates on a mains or battery power supply, in which an alarm blade of a suitable size is placed.

The substrate used is prepared by compression and cut to size. 5

The following two examples are used to make the alert board.

Example 1. The pyrethrin derivative and the silicone oil are dissolved in a solvent in which both are soluble. For example, trichloroethane. The amount used is 0.2% w / w pyrethrine derivative and 0.4% w / w viscosity 350mPa methyl silicone oil based on solvent. The mat impregnated with the solution an appropriate equipment, then at 40 ° C for ⁵ sékletü tem- dried with hot air. The blades are then packaged in a sealable aluminum foil wrapped with a plastic film.

Example 2. The pyrethrin derivative and the silicone oil were dissolved in methyl isobutyl ketone. The composition of the solution is 0.25% by weight of pyrethrin derivative and 0.5% by weight of methylphenyl silicone oil having a viscosity of 300 mPa based on the solvent. In the following, the procedure of Example 1 is followed.

Claims (1)

A sustained release insect repellent, wherein the solvent is 0.15-0.25% by weight of a pyrethrin derivative and 0.3-0.5% by weight of a methyl or methyl viscosity of 100-500 mPa. containing phenyl silicone oil in a solvent, preferably trichloroethane.