JPS6013701A - Insecticidal wettable powder - Google Patents

Abstract

PURPOSE:An agent not separating an insecticidal component into oily drops even by diluting it with water, showing insecticidal effect for a long period even when applied to an absorbing wall face, capable of reducing number of applications and the amount applied, obtained by adding a specific carrier to an insecticidal activity component liquid at normal temperature. CONSTITUTION:A carrier of calcined synthetic hydrous silicon oxide having high oil absorption properties, slightly decomposing an insecticide is blended with a compound liquid at 20-25 deg.C (room temperature) as an insecticidal activity component, especially organic phosphorus insecticide such as fenitrothion, pirimiphos- methy1, malathion, diazinon, etc. or an insecticide such as tetramethrin, etc. having high controlling effect on insect pests such as mosquitoes, flies, etc. at room temperature or optionally at 30-80 deg.C to give wettable powder. An amount of the insecticidal activity component as an active ingredient is 10-80wt%, preferably 40-60wt% in the wettable powder, and an amount of the carrier of calcined synthetic hydrous oxide is 1/3 as much as the active component.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insecticidal wettable powder which contains, as essential ingredients, an ingredient that becomes liquid at 20 to 25°C and calcined synthetic hydrated silicon oxide as an insecticidal active ingredient.

Conventionally, when formulating insecticides that are liquid at room temperature (same below 20 to 25°C) into wettable powders, highly oil-absorbing fine powder solids such as synthetic hydrated silicon oxide (hereinafter referred to as white carbon), Diatomaceous earth, Attabulgite clay, montmorillonite clay, and the like are used as carriers, but white carbon is particularly widely used because it has high oil absorption and hardly decomposes many insecticides. Among these wettable powders, for example, fenitrothion wettable powder is widely used to control malaria mosquitoes, etc., but this wettable powder is diluted with water, made into a suspension, and sprayed on the walls of houses etc. However, when controlling pests such as mosquitoes and flies that come into contact with this wall surface, if the wall surface is a non-absorbent wall surface such as stone or decorative plywood, the pest control effect can be maintained for a long period of time. If the wall surface is absorbent, such as wood, the pericarp of a plant, earthen wall, concrete wall, etc., it is difficult to maintain the pest control effect over a long period of time. Furthermore, depending on the carrier and the type of dispersant added during formulation, the insecticide may separate into oil droplets when diluted with water and suspended.

The present inventors have found that when calcined white carbon is used as a carrier for a hydrating agent containing an insecticidal active ingredient that is liquid at room temperature, the insecticidal ingredient remains in the form of oil droplets even when diluted with water and made into a suspension. It does not separate, and even when sprayed on absorbent walls to control pests, the pest control effect can be maintained for a long period of time. Therefore, when controlling pests such as mosquitoes and flies, the number of sprays and The present invention was completed based on the discovery that the amount of spraying can be reduced.

In the present invention, insecticidal active ingredients that are liquid at room temperature include insecticides that are liquid at room temperature, particularly organophosphorus insecticides that are highly effective in controlling pests such as mosquitoes and flies, such as fenitrothion, pirimiphos-methyl, malathion, and diazinon. In addition, insecticides that are liquid at room temperature can be produced by mixing these liquid insecticides with insecticides such as tetramethrin, diphenothrin, permethrin, phenothrin, deltamethrin, cabsurin, cyfluthrin, fresrin, and fenvalerate.

Further, certain dispersants or auxiliary carriers may be added to the present insecticidal permanent agent.

Calcined white carbon is white carbon manufactured by wet method: / (Farm Chemicals Han
dbooksg c2ta), such as Tokusil ■ (Tokuyama Sodasha), Carplex ■ (Giotsugi Pharmaceutical Co., Ltd.), (Taki Hijo), etc., are baked at 600°C to 900°C, preferably 700 ``C to 800''C. (Japanese Patent Publication No. 55-6669, Japanese Patent Publication No. 47-186)
Publication No. 5). However, those that exhibit alkalinity when diluted with water during firing and those that have a particle size of 10 parts or more are not preferred. Dispersants do not need to be added, but if added, anionic surfactants such as lignin sulfonates, alkyl sulfates, alkylaryl sulfonates, dextrin, gum arabic, carboxymethyl cellulose (
Hereinafter referred to as CMC. ] etc. are used. However, those that emulsify the active insecticidal ingredient are not preferred.

The auxiliary carrier does not need to be added, but if it is added,
Fine powders with low oil absorption properties such as calcium carbonate, crushed stone powder, talc, glucose, sucrose, ammonium sulfate, ammonium phosphate, and urea are used.

The insecticidal active ingredient, which is the active ingredient, is usually 10% in the hydrating powder.
from 80%, preferably from 40% to '60%,
It can be manufactured into a calcined white car as a carrier.

That is, calcined white carbon or powder components such as an auxiliary carrier and a finely divided dispersant are charged into a ribbon-type mixer or a screw-type mixer, and the mixture is heated at room temperature or at 80 to 80°C as necessary. While mixing, the insecticidal active ingredient is heated to room temperature or 80 to 80° C. if necessary, and then mixed.

The Jump is then crushed through a crusher, such as a hammer mill or a bottle mill, in order to thoroughly and uniformly mix the active ingredient or dispersant. Further, by uniformly mixing this again using a ribbon type mixer or a screw type mixer, the desired insecticidal wettable powder can be obtained. In addition, if a high-speed rotary blade type mixer such as a juice mixer type mixer or a Henschel mixer (Mitsui Miike Manufacturing Co., Ltd.) is used, each of the above-mentioned mixing-grinding-mixing steps can be performed in the same device by adjusting only the stirring speed. be able to.

Next, Examples, Comparative Examples, and Test Examples are shown.

Note that parts and % are parts by weight and % by weight, respectively.

Example 1 Commercially available white carbon (Carplex #80) was
40 parts of fired white carbon obtained by firing at 600°C, 700" for 8 hours at 0,800°C or 900°C using an electric furnace was weighed into a glass beaker, and 60 parts of fenitrothion was added to the glass beaker. The mixture was thoroughly mixed with a stick and mixed for 5 minutes at room temperature using a high-speed rotary blade mixer (juice mixer type mixer) to obtain four types of fenitrothion wettable powders.

Example 2 Commercially available white carbon (Tokuseal P1 Nip Seal N800A or Carplex #80) was fired at 700°C for 1 hour using an electric furnace as in Example 1.
40 parts of fired white carbon, 60 parts of fenitrothion
In the same manner as in Example 1, eight kinds of 7-enitrothion permanent agents were obtained.

Example 8 32.5 parts of fired white carbon obtained by firing commercially available white carbon (Carplex #80) at 700°C for 8 hours in the same manner as in Example 1 and 8 parts of sodium dodecylbenzenesulfonate were mixed into a ribbon. 64.5 parts of fenitrothion heated to 40° C. was weighed into a mold mixer and mixed at room temperature for one portion. This was then ground and mixed using a Hacimar mill, and further mixed for 10 minutes using a ribbon mixer at room temperature to obtain a fenitrothion wettable powder.

Example 4 A fenitrothion wettable powder was obtained in the same manner as in Example 8 using fired white carbon obtained by firing commercially available white carbon (Tokusil P) at 800°C for 1 hour in the same manner as in Example 1. .

Example 5 A fenitrothion wettable powder was obtained in the same manner as in Example 8 using the same 27 parts of calcined white carbon, 26 parts of calcium carbonate, 2 parts of calcium lignosulfonate, and 48 parts of fenitrothion.

Example 6 A fenitrothion wettable powder was obtained in the same manner as in Example 8 using the same 27 parts of calcined white carbon as in Example 4, 27 parts of glucose, 8 parts of sodium dodecylbenzenesulfonate, and 48 parts of fenitrothion.

Example 7 22 parts of fired white carbon obtained by firing Tsubushir N800A) on commercially available white carbon at 800°C for 8 hours in the same manner as in Example 1, 1 part of sodium lauryl sulfate, 2 parts of 0M0, and 58% of ammonium phosphate. A fenitrothion wettable powder was prepared in the same manner as in Example 8 using 5 parts and 21.5 parts of fenitrothion. Obtained.

Example 8 A procedure was carried out in the same manner as in Example 8 using 25 parts of calcined white carbon obtained by calcining commercially available white carbon (Tokusil GU Ni N) at 800°C for 1 hour in the same manner as in Example 1 and 75 parts of fenitrothion. A fenitrothion wettable powder was obtained.

Example 9 Virimiphos methyl water was prepared by using virimiphos methyl instead of fenitrothion in Example 6.

I got Japanese medicine.

Example 1O A malathion wettable powder was obtained in the same manner as in Example 8 using 40 parts of calcined white carbon, 8 parts of calcium lignin sulfonate, 2 parts of sodium alkylnaphthalene sulfonate, and 55 parts of malathion.

Processing Example 11 A diazinon wettable powder was obtained by using diazinon in place of fenitrothion in Example 5.

Longevity Example 12 The same 27 parts of calcined white carbon, 28.9 parts of calcium carbonate, 2 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, 48 parts of fenitrothion, and 2.1 parts of tetramethrin as in Example 8 were used. A fenitrothion/tetramethrin wettable powder was obtained in the same manner as in 8.

Comparative Example 1 The same commercially available white carbon (Carplex #80) as in Example 1 was used without firing or at 800”C, 500°C.
Alternatively, 60 parts of fenitrothion was added to 40 parts of white carbon obtained by firing at 1000°C for 8 hours, and 5
Four types of fenitrothion hydrating agents were obtained in the same manner as J[l.

Comparative Example 2 Using the same commercially available white carphone as in Example 2 without firing, three types of fenitrothion hydrating agents were obtained in the same manner. .

Comparative Example 8.4.5.6 Using unfired white carbon instead of the fired white carbon of Examples 8, 4.5, or 6, respective fenitrothion hydrating agents were obtained in the same manner.

Comparative Example 7.8.9 Using uncalcined white carbon instead of the fired white carbon of Example 9.10 or 11, virimiphos methyl hydrating agent, malathion hydrating agent or diazinon hydrating agent was prepared in the same manner. Obtained.

Test Example 1 The fenitrothion aqueous phase agents lOf of Example 1 and Comparative Example 1 were placed in a 200° beaker containing 19.2° hard water (90°), stirred gently with a glass rod, and the separated oil droplets were deposited on the bottom of the beaker. Suck it up with a dropper and check the amount of separation.
child.

The results are shown in Table 1.

Table 1 The physical properties of the calcined synthetic hydrous silicon oxide were measured according to the following methods.

Moisture: Calculated synthetic hydrous silicon oxide which was allowed to absorb moisture until it reached a constant weight by being left at 20 to 25° C. at a humidity of 50 to 60% was heated to 105° C., and its dry mu was calculated to calculate the moisture content.

Oil i: The oil absorption level of pheni(・lotion) was determined according to the method for measuring the oil absorption of flaxseed in JIs K5101 < Pigment Test Methods.

Ryo Ii BhT N2 adsorption method (Yuasa Battery ■ Monosolve)
I depended on it.

Test Example 2 The fenitrothion aqueous phase agents of Example 2 and Comparative Example 2 were added to 19.2 degree hard water in the same manner as in Test Example 1, and the amount of oil droplets separated was investigated.

The results are shown in Table 2.

Table 2 The physical properties of the synthetic hydrated silicon oxide were measured in the same manner as in Test Example 1.

Test Example 3 Using the fenitrothion aqueous phase agents of Examples a, 4.5 and 6 and Comparative Examples 8, 4.5 and 6, the amount of oil fraction lII was determined in the same manner as in Test Example 1, and the amount of oil was measured on a long absorbent wall surface. We investigated the insect pest control effect of mud bricks.

Go! $　l　a　$−1<　town.

Table 8: Culex mosquito mortality rate (X) was determined by the following test method.

A water diluted solution of the test hydrating powder was sprayed from a distance of 80 LM onto a 20 crn x 20 L: rn adobe brick, and fenitrothion as an active ingredient was found to be 29 Ar.
? Chemically treated mud bricks were prepared so that

The sun-dried bricks were stored under conditions of 25°C±2°C1 and humidity of 60±10%, and subjected to the following tests for 2 hours, 1 week, 2 weeks, 4 weeks, or 8 weeks.

A plastic cage with a diameter of 9 crm and a depth of 1 crn was placed over the chemically treated adobe bricks, and two adult female Culex pipiens were placed inside the cage.
0 were released, and 1 hour later they were moved to another cage, given 5% sugar water, and left for 24 hours. Dead adults were counted and the mortality rate was calculated.

As is clear from the test results, the fenitrothion perpetuating agent of the present invention does not separate in the form of oil droplets, and maintains its pest control effect on the absorbent wall surface for a long period of time.

Test Example 4 Using the virimiphos methyl hydrating agent of Example 9 and Comparative Example 7, the malathion permanent agent of Example 10 and Comparative Example 8, and the tiazinone permanent agent of Example 11 and Comparative Example 9, The pest control effect of dried bricks was investigated.

The results are shown in Table 4.

Claims (1)

[Claims] An insecticidal wettable powder comprising, as insecticidal active ingredients, a component that becomes liquid at 20 to 25°C and calcined synthetic hydrous silicon oxide.