JPS6212761B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to foamable emulsion compositions.

Spraying methods in which a pesticide active substance is applied in the form of a foam to the target area are attracting attention, particularly in the field of ant control. When controlling termites, underfloor treatment is naturally necessary due to the ecology of termites. However, pest control work in a narrow space such as under the floor is not only inefficient but also undesirable from the health management perspective of workers. For this reason, a lathe method was developed in which the chemical is applied in the form of a foam. This method allows detailed application to be performed remotely from outdoors, reduces the chance of direct contact with the chemical, and also reduces the chances of direct contact with the chemical. Advantages such as the ability to alleviate discomfort caused by solvent odor experienced during processing can be obtained.

By the way, in order to treat pesticide active substances in the form of foam, it is necessary to give the chemical solution foaming properties. Next, in order to have foaming properties, a predetermined amount of foaming agent is added to the drug solution diluted to a predetermined concentration, or a foaming agent is added to the drug itself in advance and the composition is prepared as appropriate before use. At first, two solutions can be considered: diluting and preparing the solution.
However, in the conventional foaming construction method, foaming agents were only available in the form of aqueous solutions, so the agent was formulated in the form of an emulsion or wettable powder, and the foaming agent was formulated in the form of an aqueous solution. The complicated method of diluting and preparing the two formulations on-site was exclusively used. However, in such foaming construction methods, it is necessary to add an auxiliary agent to stabilize the foamed foam (improve foam retention), and this auxiliary agent has conventionally been added to the foaming agent. However, according to the findings of the present inventors, the concentration of this auxiliary agent in the final chemical solution has an extremely large effect on the foam stabilizing effect, and the conventional so-called two-component system (where the drug and foaming agent are prepared separately) ), it has been found that it is difficult to adequately control the concentration, and in order to solve this problem, it has been desired to develop a composition in which a foaming agent and an adjuvant are blended into the drug.

The present invention provides a one-component foamable emulsion composition in which a foaming agent and an auxiliary agent are pre-blended in a drug. More specifically, the formula RO−
(CH ₂ CH ₂ )nH (wherein, R is a lower alkyl group, n
The present invention relates to a foamable agrochemical emulsion composition comprising ethers represented by 1 to 8), higher alcohol sulfate ester salts, an agrochemical active substance, and a foam stabilizer.

Using foaming agents and adjuvants in the form of aqueous solutions
It is not possible to prepare emulsions because the product emulsifies. It has been found that, through some innovations, higher alcohol sulfate ester salts can be obtained in a water-free state. In the present invention, higher alcohol sulfate salts are used as foaming components, and include higher saturated or unsaturated alcohol sulfate salts having 12 to 16 carbon atoms and polyoxyethylene lauryl ether sulfate salts (ethylene oxide 2 to It contains about 5 moles of condensate), and should be formulated in a form that does not contain water when formulating it. Particularly good examples include ammonium lauryl sulfate, sodium lauryl sulfate, sodium oleic sulfate, and ammonium polyoxyethylene lauryl ether sulfate.

In the present invention, there are restrictions on the solvents that can be used because the drug itself is foamable (it will foam if its diluted solution is sprayed with a suitable foaming and spraying device). Hydrocarbons such as white kerosene and xylene, which are general-purpose solvents for termite control emulsions, cannot be used in the present invention because they have the effect of reducing foaming properties, and among glycol solvents, ethylene glycol, propylene glycol, etc. It was found that polyoxyethylene glycol cannot be used because it deteriorates the emulsification state of the product. According to the invention, _the formula RO-( _CH2CH2O )nH, where:
It has been found that ethers represented by R is a lower alkyl group and n is 1 to 8 are most suitable as solvents. The ethers represented by the above formula include cellosolves (n=1), carbitols (n=2), and polyoxyethylene glycol lower alkyl ethers with a condensed mole number of 3 to 8 ethylene oxides. For example, methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl carbitol, ethyl carbitol, butyl carbitol, and polyoxyethylene glycol methyl ether (=4.2 to 4.6) are good examples.

The emulsion of the present invention contains an emulsifier. Typical examples include polyoxyalkyl phenol ether, polyoxycastor oil ether, polyoxystyrenated phenol ether, and alkylbenzene sulfonate. Note that some commercially available emulsifiers may contain solvents such as xylene that have the property of reducing foaming properties, but contamination in the amount contained in these solvents is not considered to be a problem in the present invention. Must not be.

The composition of the present invention contains an adjuvant for foam stabilization, such as lauryl alcohol. In addition, polyvinyl alcohol and CMC can also be used, but lauryl alcohol is most suitable.

The agricultural chemical active substance that can be used in the present invention is not limited to its activity or the type of compound, and is not particularly limited as long as it is an active ingredient compound that can be used for general emulsification. It can be conveniently applied to the foaming emulsification of active substances and their often used mixtures of wood preservatives and termite control agents.

The emulsion of the present invention can be formulated according to known methods. The amount of foaming agent added can be selected from the range of 0.5 to 2 parts by weight per 1 part by weight of the pesticide active substance. The amount of auxiliary agent added for foam stabilization is an important factor because it is related to foam retention.
For example, when lauryl alcohol is used as this adjuvant and chlordane is used as a termite control agent, the concentration of lauryl alcohol in the final diluted chemical solution is 0.15 to 0.2% (by weight; the same applies below), and the concentration of chlordane is 2 to 3%. The most preferable embodiment is to incorporate the compound into the emulsion composition by considering the dilution ratio as follows. In other words, the foamable emulsion composition used after dilution 10 times contains 20-30% chlordane and 1.5-2% lauryl alcohol. When used after being diluted 20 times, the foamable emulsion composition contains 40% chlordane and 3 to 4% lauryl alcohol.

If the amount of lauryl alcohol added is out of this range, the defoaming half-life will be greatly affected, and according to a model underfloor test (sealed condition), when the concentration of lauryl alcohol in the final diluted solution is 0.15% and 0.2%, 12 hours or more, 30 minutes for 0.1%, 15 minutes for 0.5%,
At 0.3% it was found to have a half-life of 40 minutes.
When the half-life is shortened, the distance that the bubbles can reach is shortened, and the drug is consumed excessively. The above concentration range of lauryl alcohol is the optimal range determined by comprehensively considering the results obtained from model tests such as the degree of adhesion to hard-to-reach areas such as the back of the floor and the back of pillars, half-life, and required construction time. Therefore, in emulsion compositions for 10-fold dilution, lauryl alcohol is contained in the formulation at 1.5 to 2%.
It is one of the typical embodiments of the present invention to incorporate the compound at a ratio of 3 to 4% in an emulsion composition for 20-fold dilution.

The emulsion of the present invention can protect crops, regulate plant growth,
It can be used in fields such as weed extermination, wooden structures (for example, houses), etc., depending on the effectiveness and applicability of the compounded pesticide active substance. When using, use a suitable commercially available foam dispersing device (e.g. "Tortle", a device manufactured and sold by the present applicant) that is diluted to a predetermined concentration.
You can use .

Next, some examples of the present invention will be shown, but the ingredients and their proportions can be changed as appropriate.

Example 1 Chlordane 40% Wood preservative 1F-1000 6% Emulsifier (Matsumoto Yushi Pharmaceutical: Hymar CX and Penerol SP-24) 10% Water-free lauryl sulfate Ammonium (foaming agent) 20% metquin polyethylene glycol (=4.2~4.6) (solvent) 21% Lauryl alcohol (foam stabilizer) 3% Mix well to make an emulsion.

For example, this product is diluted 20 times with water and used to control termites under the floors of houses.

Example 2 Chlordane 20% Wood preservative IF-1000 3% Emulsifier (same as in Example 1) 6% Water-free lauryl sulfate Ammonium 10% Butyl carbitol (solvent) 59.5% Lauryl alcohol 1.5% Mix well to make an emulsion.

For example, this product is diluted 10 times with water and used to control termites under the floors of houses.

Example 3 Chlorpyrifos (generic name/insecticide) 20% Emulsifier (Toho Chemical, Solpol 3005) 5% Water-free oleyl sulfate ester soda (Foaming agent) 20% Butyl cellosolve (solvent) 53.5% Lauryl alcohol 1.5% Mix well to make an emulsion.

For example, this product is diluted 10 times with water and used to control termites under the floors of houses.

Example 4 MEP (common name/insecticide) 10% Emulsifier (Solpol 3005) 5% Water-free polyoxyethylene lauryl ether sulfate ammonium (foaming agent) 20% Ethyl cellosolve (solvent) 63.5% Lauryl alcohol 1.5% Mix well to make an emulsion.

For example, this emulsion is diluted 10 times with water and used to control termites under the floors of houses.

Test Example (1) Emulsification state Emulsions prepared using ethylene glycol, propylene glycol, and polyoxyethylene glycol (#200) in place of butyl carbitol in the formulation of Example 2 had poor emulsification states, especially for polystyrene. The product using oxyethylene glycol turned into a gel and was judged to have no commercial value. In contrast, the emulsification state of the product of the present invention in Example 2 was extremely good. The judgment was based on visual observation.

(2) Foaming properties Regarding the emulsion using xylene as the emulsion and ammonium polyoxyethylene alkylaryl ether sulfate ester as the foaming agent in the formulation of Example 2, a commercially available foaming agent (" Dolph Ohm”) and Ross
As a result of a comparative test using the Miles method, "Dolph Ohm" was superior.

(3) Expansion ratio and retention property The foaming ratio and retention property of the emulsion in (2) above and the emulsion of Example 2 were investigated using a commercially available foam dispersion device (trade name "Truil").
The product of the present invention was better at 130x and 220x.
The antifoaming half-life device lasted for over 10 minutes and over 12 hours in the model underfloor test (sealed state), respectively. Since termite control requires bubble residence time on the column surface, it was determined that sufficient penetration of the chemical solution into the interior was not achieved in the control plot.

Claims (1)

[Scope of Claims] 1. Ethers represented by the formula RO-(CH ₂ CH ₂ O)nH (wherein R is a lower alkyl group and n represents 1 to 8), higher alcohol sulfate ester salts, and pesticide action. A foamable pesticide emulsion composition comprising a substance and a foam stabilizer. 2. A patent claim consisting of ethers represented by the formula RO-(CH ₂ CH ₂ O)nH (wherein R is a lower alkyl group and n represents 1 to 8), higher alcohol sulfate ester salts, chlordane, and lauryl alcohol The foamable agricultural chemical emulsion composition according to item 1. 3. The foamable agricultural chemical emulsion composition for 10-fold dilution according to claim 2, which contains lauryl alcohol at a ratio of 1.5 to 2% (by weight) in the formulation.