CS261088B1 - Solvent for high-concentrated emulsible concentrates of pesticide-efficient substances with high crystalline capacity - Google Patents

Abstract

The solution relates to the use of 4-ethyl-1,3-dioxolan-2-one as a solvent for high concentration emulsifiable concentrates pesticidally high crystallization active ingredients ability, because it is very good miscible and] with some, especially lower alcohols, ketones and ethers. Therefore, for the final treatment of pesticidal substances may be used in admixture with these solvents, general with the solvents with which it is mixed. Concentrated emulsifiable concentrates are used to prepare low-concentration aqueous emulsions, for preparation economical sprays, and can also be used undiluted to direct applications.

Description

The present invention relates to the use of 4-methyl-1,3-dioxolan-2-one as a solvent for highly concentrated, emulsifiable concentrates of pesticidal active substances with high crystallinity. These can be used directly or with the preparation of emulsion spray liquids.

Many pesticidal substances are difficult to form into emulsifiable concentrates having a higher active ingredient content. Examples are preparations

Afalon 20 EC 200 g of N- (3,4-dichlorophenyl) -N‘-methoxy-N‘-methylurea (1),

Afugan 295 g of O, O-diethyl-O- (6-ethoxycarbonyl-7-methyl-3,8-diazaindolizin-2-yl) -thiophosphate (1),

Baygon 20 EC (20% 2-isopropoxyphenyl-N-methylcarbate),

Betanol 157 g of O- (3-methoxycarbonylanilino-N - / - 3-methylphenyl) carbamate (1),

Decemtion EK — 20 (20% O, O-dimethyl-S-phthalimidomethyldithiophosphate),

Fademorf EK-20 [20% N- (1-formamido-2,2,2-trichloroethyl) marfoline],

Saprol 200 g of 1,4-bis (2,2,2-trichloro-1-formamidoethyl) -piperazine (1).

The reason for this phenomenon is that many active substances, especially if they have one or more nitrogen atoms in the molecule, have a high crystallinity, low solubility in aromatic and aliphatic hydrocarbons, cycloparaffinic solvents, some ketones, ethers and mixtures thereof.

The high crystallization capacity, low solubility of the compounds in commonly used solvents for the production of emulsifiable concentrates of pesticides cause many of the emulsion concentrates of the above compounds to crystallize at temperatures around 0 ° C. In many cases, the active substances crystallize from emulsion spray liquids (aqueous emulsions), especially if the spray liquids contain several percent of the active substances, making it impossible to use emulsifiable concentrates for the preparation and use of economical sprayings or for the preparation of spray liquids for aerial application.

It has now been found that the above drawbacks can be overcome by using propylene carbonate as a solvent for the highly concentrated, emulsifiable concentrates of pesticidal active substances with high crystallinity.

Propylene carbonate makes it possible to produce highly concentrated emulsifiable concentrates of pesticidal active compounds such as

N- (3,4-dichlorophenyl) -N‘-methoxy-N‘-methylurea (linuron),

1,4-bis (2,2,2-trichloro-1-formamidoethyl) -piperazine (triforine),

N- (k-formamido-2,2,2-trichloroethyl) -morpholine (trimorphamidine,

O- (3-methoxycarbonylanilino-N- (3-methylphenyl) carbamate (phenmediphamine,

O, O-dimethyl-S-phthalimidomethyldithiophosphate (phosmet) and the like.

In the case of propylene carbonate, it is a compound having a very low melting point of -55 ° C, a high boiling point of 240 ° C, low miscibility with water and compounds with a high crystallinity capable of dissolving very well with it.

In addition, propylene carbonate itself is very well miscible with some, especially lower alcohols, ketones, ethers, and therefore can be used in admixture with these solvents, in general with the solvents with which they are mixed, for the final treatment of pesticidal substances.

Due to the solvent properties of the propylene carbonate, it is possible to prepare 40 to 70% emulsifiable concentrates of even hardly editable substances such as trimorphamide, phosmet, linuron, etc.

In addition to the active ingredients, surfactants, both non-ionic and anionic, are used to prepare highly concentrated emulsifiable concentrates of pesticides, based on propylene carbonate. Examples include surfactants based on ethoxylated alkyl-, arylphenols, ethoxylated higher alcohols, ethoxylated fatty acids, higher amines, etc., alkylbenzenesulfonic acid calcium salt. In addition, emulsifiable concentrates of pesticidal active ingredients may also contain other mixtures of surfactants and solvents.

Highly concentrated emulsifiable concentrates are prepared in a simple manner by mixing the active ingredients and surfactants with propylene carbonate.

It is common to use concentrated emulsifiable concentrates for the preparation of low-concentration aqueous emulsions with an active substance concentration below 0.5%, for the preparation of economical sprays, in the form of aqueous emulsions with an active substance content of 2 to 4% and can also be used undiluted for direct application ULV - preparations).

The following examples illustrate but do not limit the invention.

Example 1

To 500 g of 85% N- (1-formamido-2,2,2261088)

WITH

-trichloroethyl) morpholine (trimorphamide), in the form of a filter cake containing toluene, add 160 g (ethoxylated castor oil), 55 g of phenyl phenyl sulfonate Ca (70% dodecylbenzenesulfonic acid calcium salt) and make up to 1 liter with propylene carbonate. After mixing and dissolution of the ingredients, a systemic fungicide concentrate of trimorphamide having an active ingredient content of 425 g / l is obtained.

Example 2

To 526.3 g of 95% dimethyl-S-phthalimidomethyldithiophosphate (phosmet), containing 2.5 pens. of methanol is added 49 g of Slovasol E1, g of phenylsulfonate Ca and the mixture is made up to one liter with propylene carbonate to obtain an emulsifiable concentrate of phophasic organophosphorus insecticide with an active substance content of 500 g / l.

Example 3

To 618.7 g of 97% N-methyl-N-methoxy-N - (3,4-dichlorophenyl) urea (linuron) is added 32 g of phenylsulfonate Ca, 61 g of Slovasol EL and made up to one sheet with propylene carbonate. After mixing and dissolving all the ingredients, an emulsifiable concentrate of herbicide containing 600 g / l of linuron is obtained.

Claims (3)

SUBJECT Use of 4-methyl-1,3-dioxolan-2-one as solvent for highly concentrated emulsifiable concentrates of pesticidally active compounds BACKGROUND OF THE INVENTION high crystallinity properties.