CZ312U1 - Adjuvants for plant protecting compositions - Google Patents

Description

Technical field

The present invention relates to adjuvants for plant protection chemicals based on vegetable oils and emulsifiers for their application.

BACKGROUND OF THE INVENTION

Crop production in agriculture, fruit growing, forestry etc. uses a number of so-called chemical agents for plant protection as pesticides, herbicides and insecticides. Their use leads to an increase in yields, an increase in quality and an increase in the economy of agricultural product production. At the same time, due to their properties, chemical plant protection products have a negative impact on the environment. In addition, they are relatively expensive products that increase the growing costs.

These deficiencies can be partially eliminated by the use of so-called adjuvants.

The general properties of the substances belonging to the group of adjuvants are to achieve better distribution and contact of the active substance with the plant surface, increase the dispersion and emulsification of the active substance, increase the adhesion on the surface of the plant and the permeability of the active substance by the plant. In summary, this means that the effect of the active substance (plant protection chemical) on the plant is significantly increased, which in turn results in the possibility of significantly reducing the dosage of the active substance or its partial replacement while maintaining biological activity.

Petrochemical-based adjuvants have been widespread to date, causing undesirable system loading due to poor biodegradability. For example, these are known adjuvants represented by a mixture of mineral oils and emulsifiers. Recently, adjuvants with vegetable oils and an appropriate emulsifying system have been available on the market, which are related to the mode of administration of adjuvants. Adjuvants are applied mainly in two ways, either by direct incorporation into the plant protection product itself, or by reducing the adjuvant with the plant protection product immediately prior to application. The disadvantage of mineral oil-based adjuvants is the higher plant phytotoxicity caused by the introduction of foreign substances into the system.

The use of vegetable oil adjuvants and emulsifiers substantially reduces phytotoxicity, since the basic constituents are naturally, readily biodegradable substances. However, their efficacy is dependent on the adjuvant property, i.e. the ability to emulsify the active plant protection chemical, which determines the possibility of reducing the dosage of the active agent and the stability of the system. Furthermore, it is important that the emulsifiers used have acceptable biodegradability properties. Thus, the effect of using an adjuvant is the result of an emulsifier system.

SUMMARY OF THE INVENTION

The above deficiencies and problems are solved by an adjuvant for chemical plant protection agents whose nature is that it contains from 2 to 25% by weight. emulsifier mixtures consisting of amphothermal surfactants, preferably phospholipids and nonionic surfactants, preferably oxyethylenates of fatty alcohols, alkylphenols and fatty acids having an alkyl carbon number of from 9 to 16 and from 4 to 8 moles of bound ethylene oxide in wt. a ratio of 2-40: 100 and the remainder being vegetable oil, preferably rapeseed oil.

Effect of the invention

The effect of the adjuvant of the invention lies in its easy biodegradability, low phytotoxicity and high emulsion stability when applied. Furthermore, its effect consists in good interaction with the chemical; substances. The high stability of the emulsion ensures an even distribution of the substance and good contact and permeability through the plants, which is conditioned by the synergistic effect of the combination of used emulsifiers with different and complementary seionic behavior and a difference in hydrophilic-lipophilic balance.

Examples of invention

The adjuvants of the invention are described in more detail in the following non-limiting examples.

Example 1:

500 kg of semi-refined rapeseed oil were pumped into a 1000 L duplicator vessel equipped with a stirrer, 5 kg of synthetic lecithin and 50 kg of oxyethylated nonylphenol with 6 moles of bound ethylene oxide were added. After heating to 40-45 ° C and stirring, a homogeneous, clear adjuvant is obtained.

The adjuvant produced after mixing with water easily forms an emulsion system containing plant protection chemicals. With the adjuvant thus prepared, the same efficacy (spraying) was achieved with half the amount of herbicide than in the cases without adjuvant.

Example 2:

500 kg of crude rapeseed oil containing 0.7% by weight were pumped into a 1000 L duplicator vessel equipped with a stirrer. natural lecithin. After heating to 40 ° C and stirring, 52 kg of oxyethylenated stearic acid with 6 moles of bound ethylene oxide were added. A homogeneous adjuvant stable under normal storage conditions was obtained. The adjuvant produced is very miscible with water over a wide concentration range to form an emulsion system containing plant protection chemicals. When compared to a commercially available vegetable oil adjuvant mixed with herbicides. The cared and Garlon when applied to winter rape, its effect was higher by 15%.

Example 3:

The adjuvant was prepared as described in Example 2 except that the mixture was not heated and oxyethylened oleic acid with 6 moles of bound ethylene oxide was used in an amount of 20 kg instead of oxyethylened stearic acid. The same results as in Example 2 were obtained.

/with? TT BHTO V- ^ REQUIREMENTS ÓCříRfít ^ Í {~

Claims (2)

/with? TT BHTO V- ^ REQUIREMENTS ÓCříRfít ^ Í {~ An adjuvant for chemical plant protection products characterized in that it contains from 2 to 25% by weight. mixtures of emulsifiers consisting of amphoteric surfactants, preferably phospholipids, and nonionic surfactants, preferably oxyethylenates of fatty alcohols, alkylphenols * and fatty acids having an alkyl number of 9-16 and y with 4-8 moles of bound ethylene oxide in a weight ratio * ' 2-40: 100, and the remainder being vegetable oil, preferably rapeseed oil.