CS219359B1 - Aerosol insecticide - Google Patents

Abstract

The invention relates to the field of insecticidal preparations for the control of crawling insects. The invention solves the problem of increasing residual effects by reducing the penetration of active substances into treated surfaces. Penetration is reduced by using a highly volatile solvent base and by excluding synergists. A mixture of synthetic pyrethroids or natural pyrethrum is used as the active substance. The maximum range of aerosol particles to the treated surface and minimal losses to the surroundings are achieved by a coarse, narrow spray (so-called "wet spray"). The high evaporation of the solvent base, the exclusion of synergists and the coarse spray cause the active substances to remain on the surface of the treated surface, thereby achieving long-term residual effects.

Description

The invention relates to an aerosol insecticidal composition, based on pyrethroids, for the control of plasma insects with long-term residual effects.

In general, aerosol insecticide compositions based on natural or synthetic pyrethroids are known whose low toxicity to warm-blooded animals is particularly advantageous for application in the human field. Plasma insect control agents are currently formulated as a so-called "dry spray" containing 60 to 85% propellant and 40 to 15% active substance based on a low-vapor petroleum or oil petroleum fraction. The low evaporation of the base is chosen in order to achieve a slow evaporation on the treated surface and thus a longer residual effect. Natural or synthetic pyrsthroids with so-called synergists, i.e. substances without their own insecticidal effect, potentiating the insecticidal effects of the insecticides themselves are used as active substances. Piperonyl butoxide, tropital, sulfoxide and others are usually used as synergists. The usual ratio of pyrethroids to synergists is 1: 2 to 1:10.

The disadvantage of the above-mentioned so-called oil-based products is their high penetration into the treated surfaces, thanks to which a significant part of the active substances does not stick to the surface of the treated surfaces and thus loses efficiency. The penetration of the active substances negatively affects in particular the duration of the residual effects of the above-mentioned preparations.

This drawback is overcome by the aerosol formulation for controlling insect pests of the present invention. Its essence is that it consists of

0.1 to 5.0 wt. % natural pyrethrum or synthetic pyrethroids, up to 40 wt. % hydrocarbon mixtures having a distillation range of 4-30 to 4-200 ° C, up to 40 wt. chlorinated aliphatic hydrocarbons boiling in the range of +40 to +80 ° C, up to 60% by weight, of liquefied propellant or gas mixtures with a boiling point of -45 to +40 ° C.

Thus, the penetration of the active ingredients is reduced both by the use of a highly volatile solvent base and by the elimination of synergists, which, while enhancing the immediate effect of the pyroid throids, but on the other hand, greatly increase the penetration of pyrethroids into the treated surface. The coarse narrow-spray aerosol formulation (the so-called "wet spray") allows maximum range of aerosol particles to the treated area and minimal losses to the surroundings.

The high evaporation of the solvent base, the elimination of the synergist and the coarse spray cause the active substances to be retained on the surface of the treated area and thus to achieve long-term residual effects. A mixture of synthetic pyrethroid with significant lethal effects (e.g. permethrin, d-phenotrin) and synthetic pyrethroid with significant stunning effects (e.g. tetramethrin, allethrin, cadethrin) or natural pyrethrum (i.e. a mixture of natural pyrethroids with complex effects).

The preparation according to the invention is prepared by the classical technology of production of aerosol preparations. A mixture of the active ingredients (pyrethroids) of volatile solvents (e.g. petrol, dichloromethane, 1,1,1-trichloroethane) and perfume is prepared in a stirred tank. This mixture is filled into aerosol containers, which are filled with liquefied propellant (eg dichlorodifluoromethane, trichlorofluoromethane, propane, butane, dimethyl ether) after closing the valve. The finished product is supplemented with a sprayer suitable for the type of application, ie a "coarse spray" spray with a direct spray for insect spraying or surface treatment where the insect is expected to occur.

Example 1

The residual biological effects of the new formulation of 0.25 parts permethrin, 0.15 parts tetramethrin, 30 parts dichloromethane, 29.6 parts gasoline 60/80, 40 parts dichlorodifluoromethane are significantly longer than the residual effects of the classic existing formulation I of 0.3 parts of tetramethrin, 1.5 parts of piperonyl butoxide, 38.5 parts of vaseline oil, 30 parts of trichloronofluoromethane, 30 parts of dichlorodifluoromethane. The residual effects on Culex pipiens molestus mosquitoes when applied to different types of surfaces are as follows:

Plywood Plywood in the sun Lime (months) (days) (days) new preparation preparation I more than 12 6 more than 21 1 to 3

Example 2

The residual biological effects of the new formulation of 0.25 parts permethrin, 0.01 parts cadethrin, 30 parts dichloromethane, 29.74 parts gasoline 60/80, 40 parts dichlorodifluoromethane are stronger compared to both classical formulation I (see Example 1) and the formulation II a more efficient but less hygienically suitable category for the human area (Actellic spray - besides pyrethrum and piperonyl butoxide contains a high dose of organophosphate - the exact composition is not known in the literature;

Percent mortality on contact of female Musea domestica with impregnated surface (paper):

mortality per min.

(hr) new preparation preparation

I preparation

II

33 0 0

100 39 23 h 60 0 23

Time of death (hours: minutes) of all the imaginative Russian domestic! Blattela germanica on treated wooden surface 2 weeks to 2 weeks new preparation I

Example 3

The new formulation O 'of 0.25 parts permethrin, 0.1 parts bioallethrin, 30 parts dichloromethane, 29.65 parts 60/80 gasoline, 40 parts dichlorodifluoromethane also exhibits 6: 00

23:00 (10%)

6:00 (60%) 24: 00 (0%) months after treatment (parental mortality in incomplete mortality):

month 2 months

6:00 (80%) 24:00 (10%) is a significantly longer residual effect than the existing classical formulation I (see Example 1). Time of death (hours: minutes) of all imaginations of Nauphoeta cinerea cockroaches exposed on treated corrugated board 1 and 2 weeks after treatment:

new preparation I: 30 more than 6: 00: 60 more than 24: 00

Claims (1)

Insecticidal aerosol formulation for the control of creeping insects based on pyrethroids, characterized in that it consists of 0.1 to 5.0 wt. % natural pyrethrum or synthetic pyrethroids, 10 to 40 wt. % of a hydrocarbon mixture having a distillation of the invention between +30 to 200 ° C, 10 to 40 wt. % chlorinated aliphatic hydrocarbons boiling from +40 to +80 ° C, 30 to 60 wt. liquefied propellant or gas mixtures with a boiling point of -45 to + 40 °