CS255882B2 - Aqueous dispersion containing sulphur - Google Patents

Description

The invention relates to an aqueous dispersion containing sulfur which is used to combat fungal diseases in plants. *

Sulfur has been known since antiquity as a means of combating fungal diseases of plants.

Today, considerable amounts of sulfur are produced substantially in the form of water-dispersible wettable powders such as ^R COSAN 80 (manufactured by Hoechst AG), ^R THIOVIT (manufactured by SANDOZ AG) and ^R KUMULAN (manufactured by BASF AG). However, wettable powders are problematic in their application because they are easy to dust and difficult to handle.

Further, there are problems when combined with other active agents. For this reason, liquid formulations, in particular water-based sulfur dispersion formulations, have recently been found to be of advantage. Liquid preparations can be dispensed more easily and safely and can be produced in the case of sulfur by wet grinding, which is a safe explosion protection.

To date, sulfur-based dispersions having an active ingredient content in the range of from 500 g / liter to 800 g / liter are known. These are, for example, products known on the market under the designation ^R MICROTHIOL TH (a product of RSR, ie Raffinerie du Soufre Réunie) containing 750 g effective

R * R substances / liter, Actiol (manufactured by Phyteurop) containing 800 g of active substance / liter, Zolfo n

(product of Sipoam) with an active ingredient content of 800 g / liter and ELOSAL (product of Hoechst Columbiana) containing 500 g of active ingredient / liter.

The disadvantage of these preparations is the frequent formation of sediments upon storage, as well as the unfavorable mixing properties when combined with other active substance concentrates which are commercially available. Flocculation can often be observed with such mixtures. Particularly disadvantageous in these formulations is the relatively low sulfur content of not more than 800 g / liter, which corresponds to a content of 80% wettable powder.

Surprisingly, new aqueous diperters containing sulfur have now been found which allow an increase in the sulfur content above 800 g of active ingredient / liter.

Accordingly, the present invention provides an aqueous sulfur-containing dispersion comprising up to 75% by weight of sulfur,

0.5 to 5% by weight of a polymeric alkylnaphthalenesulfonic acid salt with a monovalent or divalent metal cation or with NH4; and

0.5 to 5% by weight of ethoxylated alkylphenol varnish, i.e. the reaction product of nonylphenol with 1 to 2 moles of formaldehyde and 35 to 40 moles of ethylene oxide.

According to a preferred embodiment, the aqueous dispersion contains the sulfur according to the invention.

up to 70% by weight of sulfur,

1.5 to 3.5% by weight of a polymerized alkylnaphthalenesulfonic acid with a monovalent or divalent metal cation or with NH ₄ ⁺ and up to 3% by weight of ethoxylated alkylphenol novolak, i.e. the reaction product of nonylphenol with 1 to 2 moles of formaldehyde and 35 to 40 moles of sthylene oxide.

Surprisingly, this special surfactant combination ensures high stability of sulfur-based formulations even at high drug loading.

As salts of polymerized alkylnaphthalenesulfonic acids with monovalent or divalent metal cations or with NH. ⁺ is mainly used sodium salt of polymerized alkylnaphthalenesulfonic acid, ie on the market of common product, which is referred to as Darvan No. 1 (product of

Vanderbilt Co.) (cf. also Datenblatt Darvan No 1 (Vanderbilt Corp./ of January 7, 1981)).

This product is also known in Latin America under the trade name Daxad No. 17 (product of Darex / Argentina).

As the ethoxylated alkylphenolnovolac, i.e. the reaction product of nonylphenol with 1 to 2 moles of formaldehyde and 35 to 40 moles of ethylene oxide, the novolaks described in DE-OS 2901462 are particularly preferred. up to 2 mol equivalents of formaldehyde followed by ethoxylation using 30 to 40 mol of ethylene oxide, based on phenol. Thus, for example, a product of Hoechst AG known as Hoe S 2774 can be advantageously used.

The remainder of the compositions of the invention generally consists of water. However, other conventional additives, such as frost protection agents, anti-foaming agents or thickening agents, may also be added.

The compositions according to the invention may contain from 0.1 to 4% by weight, in particular from 0.5 to 4% by weight

0.2% by weight, of an anti-foaming agent, 0.5 to 15% by weight, in particular 2.0 to 15% by weight;

7.0% by weight of an antifreeze agent and 0.01 to 3% by weight, in particular 0.1 to 1.0% by weight of a thickener.

Glycol compounds such as ethylene glycol, propylene glycol may be suitable as antifreeze agents.

For example, conventional silicone compounds are used as antifoams. .

As thickeners, for example, polysaccharides can be used, for example the products known by RR under the designation Veegum (manufactured by Vanderbuilt Co., Kelzan S (manufactured by KELCO CO.) Or ^R Rhodopol 23 (manufactured by Rhone-Poulenc).

The following examples serve to illustrate the invention:

Examples illustrating the composition of preparations:

Example 1

40.0% sulfur (= 500 g / liter)

4.0% Darvan Vanderbilt Co.

2.0% Hoe S 2774 (Hoechst AG)

0.5% Veegum (Venderbilt Co.)

5.0% propylene glycol ’

0.5% anti-foaming agent SE (Wacker AG) 48.0% water.

Example 2

50.0% sulfur (= 700 g / liter)

4.0% Darvan 1

2.5% Hoe S 2774

8.0% ethylene glycol

2.0% anti-foaming agent SE 2

0.5% Veegum

33.0% water.

P. ř í к 1 and d 3

57.5% sulfur (= 850 g / liter)

4.5% Darvan 1

2.5% Hoe S 2774

0.5% ^R Kelzan S (Kelco Co.)

1.5 ‘i anti-foaming agent SE 2

8.0% propylene glycol

25.5% water.

Example 4

64.5% sulfur (= 1,000 g / liter)

2,8% Darvan 1

2.0% Hoe S 2774

5.0% propylene glycol

1.0% anti-foaming agent SE 2

0.3% Veegum

24.4% water.

Example 5

70.0% sulfur (= 1,150 g / liter) 3.0% Darvan No. 1 2.2% Hoe S 2774 0.3% Veegum 1.0% antifoam 4.0% propylene glycol 19.5% water.

All percentages refer to percent by weight.

Said compositions are prepared by wet milling using bead mills.

The formulations made according to the above recipes are freeze-resistant to -10 ° C and stable at 50 ° C for at least 3 months.

The above compositions are readily miscible with emulsion concentrates of other plant protection agents that are commercially available.

The miscibility of the aqueous sulfur-containing dispersions of the invention with other concentrates is illustrated by the following examples:

Amount of water used: 400 liters / ha

The amount used in the formulation at the indicated concentrations:

conunon name

sulfur 1 ooo у / liter: ^R Acricid 40 EC ^^ Binapacryl sulfur 1 ooo g / liter: ^R Hostathion 40 ЕС Triazophos sulfur 1 ООО g / liter: ^R Hostaguick 50 ЕС Heptanophos sulfur 1 ООО g / liter: Dimethoat 50 ЕС sulfur ]. ООО g / liter: Decis 2.5 ЕС Delthamethrin sulfur 1 000 g / liter: ^R Thiodan 35 EE Endosulfan sulfur 1 000 g / liter: ^R Kelthane 50 EE Dicofol sulfur 1 000 g / liter: ^R Metasystox 25 ЕС Demeton-S-methyl

sulfur 1 000 g / liter sulfur 1 000 g / liter sulfur 1 000 g / liter sulfur 1 000 g / liter sulfur 1 000 g / liter sulfur 1 000 g / liter sulfur 1 000 g / liter

^R Nexion 40 ЕС ^R Dithane Ultra WP ^{2 R} Dipterex WP 50 ^R Pirimor WG ³⁾

R 41

Decis Flo ²

Bromophos

Mancozeb Trichlorphon Pirimicarb Delthamethrin ^R Complesal 5-8-10 ^R Complesal 12-4-6

Explanatory notes: 1) ЕС = emulsion concentrate

2) WP = wettable powder

3) WG = granulate of the active substance

4) Flo = dispersion

Claims (5)

OBJECT OF THE INVENTION A sulfur-containing aqueous dispersion comprising from 40 to 75% by weight of sulfur, from 0.5 to 5% by weight of a monovalent or divalent metal salt of polymerized alkylnaphthalenesulfonic acid or with NH4 and from 0.5 to 5% by weight of ethoxylated alkylphenol novolac, i.e. the reaction product of nonylphenol with 1 to 2 moles of formaldehyde and 35 to 40 moles of ethylene oxide. 2. The sulfur-containing aqueous dispersion according to claim 1, characterized in that it comprises from 60 to 60% 70% by weight of sulfur, 1.5 to 3.5% by weight of a polymeric alkylnaphthalenesulfonic acid salt of a monovalent or divalent metal cation not containing a ^ ⁺ and 1 to 3% by weight of ethoxylated alkylphenol novolac, i.e. the reaction product of nonylphenol with 1 to 2 moles of formaldehyde; 35 to 40 moles of ethylene oxide. The sulfur-containing aqueous dispersion according to claim 1 or 2, characterized in that the ω-salt of the polymerized alkylnaphthalenesulfonic acid comprises a corresponding alkali metal, alkaline earth metal or ammonium salt. Sulfur-containing aqueous dispersion according to one of Claims 1 to 3, characterized in that it contains, as the salt of the polymerized alkylnaphthalenesulfonic acid, the corresponding sodium salt. 5. The sulfur-containing aqueous dispersion of claim 4, wherein the amount of monmorillonite comprises an amount corresponding to the weight% of the polymerized alkylnaphthalenesulfonic acid sodium salt.