DD214520A1 - STABLE SUSPENSION CONCENTRATES INSECTICIDAL ACTIVE SUBSTANCES - Google Patents

Abstract

The invention relates to stable suspension concentrates with insecticidal agents. According to the invention, from 1 to 15% by weight of montan wax is added to them as an aqueous emulsion for stabilization.

Description

VEB Chemiekombinat Bitterfeld Bitterfeld, 18. 2. 1983

OZ 2356

Stable suspension concentrates of insecticidal active ingredients Field of application of the invention

The invention relates to stable suspension concentrates with insecticidal agents.

.Characteristic of the known technical solutions

The possibility of formulating various suitable biologically active compounds as suspension concentrates (ELowables) 25U is known (DD-PS ⁴ 114 215, DD-ES 114 216).

The prepared suspension concentrates (DE-OS 2716 555), however, tend to sedimentation and agglomeration, which reduces the utility properties of these preparations · This is especially true if a after months of storage unavoidable sediment formed and by slight mechanical action (shaking, stirring ) no homogeneous distribution is achieved. It has already been tried by additives, for example by special emulsifiers, to achieve a stabilization of the suspension concentrates (DE-OS 235 446, DE-OS 2602537).

Also, the addition of xanthan gum, a heteropolysaccharide, has been proposed for this purpose (US Pat. No. 3,948,636). ;

'. , '..'. · '. '. ':; 2 · \ ..:,;. ' · .; ^; oz 2356 ..,. ·,

Likewise, the addition of terdigitation agents is known (DE-OS

30 11 611). '-''-, /,. '. - '' / ' ^: ..'"'.;:.''.

However, these known technical solutions do not lead to storage-stable suspension concentrates.

Aim of the invention

The aim of the invention is to produce stable suspensocondensates of insecticidal active ingredients.

Presentation of the IVesens of the invention ;

This object is achieved in accordance with the invention by adding from 20 to 50% by weight of active compound, 5 to 20% by weight of additives, such as emulsifiers, preferably ethylene oxide adducts based on alkylpbenols or longer-chain fatty acids, antifoams, Preferably, paraffins, and antifreeze, preferably glycols, and 0 to 60 wt .-% of water existing suspension concentrate insecticidal agents, 1 to 15 wt .-% montan wax added as an aqueous emulsion. Montan wax consists of 17 to 19% of wax acids, mainly 30 % lignoic acid and 17% montanic acid, 3 to 4% primary wax alcohols, 1% secondary wax alcohols, 58 to 59% wax esters, 10 % wax ketones and 10 biJ3 15 % montan resins * The aqueous montan wax emulsion prepared in a conventional manner and contains 5 'laIs. 35 wt .-% montan wax, preferably 20 to 25 wt .-%, 2 to 8 wt .-% of a. Alky! Phenylpolyglykolethers and / or reacted with propylene or ethylene oxide aliphatic compound, in particular Fettalkohoi and water, added to 1Ö0 wt .-%.

The emulsion can also be prepared with the addition of 0.1 to 1% by weight of potassium hydroxide.

3 OZ 2356

The preparation of the suspension concentrates is carried out in a known manner by means of wet fine grinding, for example in agitated media. The solid active ingredient is present in the suspensions in a particle size <10 / um, preferably less than 5 / um. Water, additives and the montan wax emulsion are mixed with stirring and then the solid active ingredient added. This mixture is brought to the desired particle size by the above wet-fine grinding.

embodiment

The stated formulations were prepared in the same way. Water, additives and montan wax emulsion were mixed and then the solid active ingredient was added with stirring. The mixture was then ground in a stirred ball mill.

The stability of the suspension concentrates was checked by Jjagerversuche at room temperature.

The montan wax emulsion contained in the following formulations 25% by weight montan wax *

The following formulations were included in the experiments:

Formulation 1

40.0% by weight of tricyclohexyltin hydroxide

5.0% by weight of ethylene oxide adducts based on alkylbenzenes 2.0% by weight of paraffin wax II

5.0% by weight of montan wax emulsion 48.0% by weight of water

4- OZ 2356 ", ·

Formulation 2

40.0% by weight /% -1.2% of V & rHexachiorGyölöbexas (lindane) 5.0% by weight of ethylene oxide adducts based on alkylphenols 5.0% by weight of paraffin wax II

15% by weight of montan wax emulsion

35 * 0 Gew, - # water

Comparative Formulation 3

60 g / 100 ml of ^ - ^^, ^, ^, ^, ö-hexachlorocyclohexane (lindane) 9 g / 100 ml of urea

1 g / 100 ml "Disperse!" (Condensate of formaldehyde with the sodium salt of naphthylsulfonic acid)

3 g / 100 ml of yellow pigment; V 0.8 g / 100 ml bentonite

0.4 g / 100 ml of "Natro-Sol ^fl 250 L (hydroxyethylcellulose) to 100 ml of water

Example: Resistance of different suspension concentrates to different storage conditions

The various formulations were stored in graduated glass cylinders of 1,000 ml and in 25 ml wide-mouth screw bottles at room temperature. As sedimentation progressed, sediment increasingly formed and above the suspension concentrate an upper aqueous phase formed.

The check of the sediment for reversibility and irreversibility was carried out at the intervals indicated as follows:

1. 200 ml of the product was stored in 25 ml of wide-mouth screw flask, which stood upright and was closed. To check the sediment, the bottles were rotated 10 times back and forth by 180 ° and then it was checked with a glass rod whether sediment was still present.

; 5: OZ 2356

2. The product was stored in 1 000 ml graduated glass cylinders (height 40 cm). The sediment was determined in% by volume and then the ease of penetration of a glass rod (Lunge 5 ° c ^m i diameter 0.4 cm) was evaluated. Stirred with the glass rod viira äie / Brcibe 10 s, with one revolution per s. If the sediment is still present, it is irreversible and in the case of homogeneity it is reversible. .

Results of storage

Formu-upper liquid-pbase sediment

lation (vol.%) (vol.%)

after months to months

3 6 12 18 3 6 12 18

Condition of the sediment

1 ο 0 5 2 , 0 2 t5 · - 0 1 , 0 1 , 0 1 , 5 reversible . 2 ': - V: '-.- : - ° 0 1 , 5 3 0 1 , 0 1 »5 1 , 5 reversible 3, -; , ο, 2 , 0 3 , 5- 0 1 , 5 2 , 0 2 , 0 irreversible

From the example, the good shelf life of the suspension concentrates according to the invention is apparent in the usual time span for the use of PSM.

Claims (1)

6. OZ 2356 invention claim Stable suspension concentrates of insecticidal active substances from 20 to 50% by weight of active compound, 5 to 20% by weight of additives, such as emulsifiers, preferably ethylene oxide adducts based on alkylphenols or longer-chain fatty acids, antifoams, preferably paraffins, and antifreeze agents, preferably glycols. and 0 to 60% by weight of water, characterized in that the formulation is admixed with 1 to 15% by weight of montan wax as an aqueous emulsion.