CS261107B1 - Binding agent for preparation or preparation mixtures anchoring with efficient substances content used during sowing seeds pickling on grain surface - Google Patents

Description

The invention relates to a binder in an aqueous medium intended to anchor substances 8 with fungicidal, insecticidal or other properties on the seed grain surface.

Experiments have shown that in the prior art, the infested seed due to the low anchoring of the preparation on the grain surface during handling, transport and especially when sowing into the soil on machines with pneumatic grain conveying, according to its type and used - 80%. In order to achieve good protection of the seed after sowing in the soil against diseases and pests, higher doses of preparations are prescribed, two to six times as necessary.

Various measures have been proposed to improve the anchoring of the preparation on the surface of seed grains:

- mix seed dressings with water or an aqueous dextrin solution during the pickling process. This results in a partial improvement in adhesion, but after complete drying the formulation falls off. In addition, aqueous solutions freeze at temperatures below 0 ° C and cannot be handled. However, seed pickling is mainly carried out in the autumn and winter months when temperatures are lowered below 0 ° C.

U.S. Pat. No. 3,113,399 proposes to use lacquer resins dispersed in an aqueous medium to anchor the formulation on the surface of the seed grains, which upon drying forms a water-insoluble film of defined hardness and abrasion resistance. According to this process, the active substances (fungicides, pesticides, etc.) are already dispersed in the binder itself. This achieves a relatively good anchorage of the active substances on the surface of the seed grains. However, the use of this process is limited to those active substances which are absolutely inert to prolonged storage with water and excipients contained in the mixture. Furthermore, the machinery used for seed dressing must be regularly cleaned from dried residues of binder material after a manual number of working hours, which is very difficult due to its insolubility in water.

These disadvantages in seed dressing can be eliminated while at the same time achieving perfect anchoring of the preparation on the surface of the seed grains with the preparation according to the invention, which is an agent for anchoring the active substances on the seed surface. or more secondary additives, wherein the binder consists of a mixture of polymeric substances, at least one of which is a hydrophilic polymer comprised in an amount of 5 to 70% by weight, calculated on the total weight of the polymers selected from the group comprising copolymers containing acrylic acid salts; methacrylic, cellulose derivatives, modified starches, and the remaining polymeric material is at least one dispersion polymer selected from the group consisting of homopolymers and copolymers of esters of acrylic and methacrylic acid, styrene, butadiene, vinyl acetate.

It has been found that by a suitable combination of the dispersion polymer with the hydrophilic polymer it is possible to completely eliminate the lack of drying of today's formulations in the production plant during the seed dressing process. This can be explained by the fact that after application of the aqueous binder dispersion with the pickling agent to the surface of the seed which does not contain a hydrophilic polymer, the drying takes place so that both the water evaporates and is discharged into the seed grains. However, on the metal parts of the machinery, only the water evaporates. In the presence of a hydrophilic polymer in the binder, the rate of evaporation of water from the surface is greatly reduced, and drying on the seed grains occurs only by draining water into the grains, while drying on the metal parts of the process equipment is avoided.

The drying of the aqueous dispersions of the binder-containing formulations was checked as follows. Perforated sheets of different hole diameters, 1, 2, 3, 4, 5 and 6 millimeters, each having 100 equal holes, were mounted in a pickling and drying drum of the pickler. After a predetermined number of operating hours of seed dressing, the blind holes were sealed. According to their quantity, the product was assessed in terms of drying on the machine parts of the technological equipment. The test preparations in the tables are marked with the letters А, В, C.

Preparation labeled:

AND.

was an aqueous thiram dispersion containing a binder according to U.S. Pat. No. 3,113,399,

B.

was an aqueous thiram dispersion containing a binder Sakrust M containing a water-insoluble polymer,

C.

was an aqueous thiram dispersion containing the binder of the present invention and the composition of Example 2.

The following values were measured for individual preparations:

The numerical values in the following table indicate in% the number of blind holes.

5 6 diameter of the hole number of working hours mm 1 2 4 8 16 Preparation A: 1 50 85 96 99 100 ALIGN! 2 40 69 83 92 100 ALIGN! 3 20 May 40 62 74 84 4 5 9 12 15 Dec 20 May 5 0 0 0 1 3 6 0 0 0 1 1 Preparation B: 1 52 80 92 ...... 95 95 2 3'5 73 81 86 85 3 3 35 60 69 70 4 0 0 1 7 10 5 0 0 0 0 2 6 0 0 0 0 0 Preparation C: 1 0 0 1 3 8 2 0 0 1 1 4 3 0 0 0 0 2 4 0 0 0 0 0 5 0 0 0 0 0

The operational review has repeatedly confirmed that when using the formulations A, V, it was necessary to shut down the equipment daily and to mechanically clean it from the dried binder formulation to ensure reliable operation of the equipment, while the binder formulation C of the present invention allowed continuous weekly without the need for technological cleaning.

Only non-phytotoxic components may be used in the preparation of the binder of the present invention. The following germination values of flax seed were found in phytotoxicity testing.

Name of test substance

Concentration of the substance dosed -% by weight

Germination in% after 7 days

control - 88 92 copolymer of vinyl acetate with dibutyl maleate 15 Dec 92 93 dibutyl phthalate plasticized methyl methacrylate homopolymer 15 Dec 90 96 methyl methacrylate-butyl acrylate copolymer 15 Dec 93 95 styrene-butadiene copolymer carboxylated 15 Dec 90 92 modified starch 5 89 91 polyphosphate 1 86 91 glycerine 5 89 89 citric acid 1 90 92 nonylphenolpolyethylene oxide ether 1 86 88 a copolymer of ethyl acrylate with sodium acrylic acid 10 90 92 dye Versaprint GRT 5 90 90 ethoxylated higher alcohol Slovasol 3525 R 1 86 90 urea 5 82 85 glucose 10 86 88 hydroxyethylcellulose 5 97 94 a copolymer of acrylonitrile with the sodium ammonium salt of acrylic acid 10 87 92 diethylene glycol 5 82 86 isopropanol 1 83 85

Dispersion polymers must have the property of forming a flexible film at a temperature below 5 ° C upon evaporation or removal of water. However, this does not mean that the polymers that form the film at a higher temperature are unusable. In such cases, however, the film-forming temperature must be reduced by adding further additives. Butyl glycol, butyl glycol acetate, gasoline, dibutyl phthalate, 2-ethylhexyl phthalate and others can be used for this purpose. The film-forming temperature reducing agent can be added directly to the dispersion polymer or only during the preparation of the binder. A further condition for the dispersion polymer is that its film formed after evaporation or removal of water is flexible and has a ductility of at least 150% of its original length. This is to prevent the binder on the seed surface from cracking and falling off the surface, particularly at reduced temperature.

The film-forming temperature and film ductility are tested according to standardized methods for evaluating dispersion polymers.

Dispersion polymers which form a water-insoluble component in the binder are aqueous dispersions of homopolymers and copolymers of acrylic and methacrylic acid esters, styrene, butadiene, vinyl acetate according to the invention. Their amount in the binder ranges from 30 to 95% by weight, based on the total polymer in the binder.

The required physical properties of the films formed after evaporation of water from the selected polymers mentioned above showed the following values:

dispersion polymer min. film forming temperature ° C film extensibility at 20 ° C% dibutyl phthalate plasticized methyl methacrylate homopolymer 0 . 450 copolymer of vinyl acetate with dibutyl maleate 4 390 copolymer of methyl methacrylate with butyl acrylate with 3% butyl glycol 5 ..... 450 butadiene-styrene copolymer carboxylated 2 680

The hydrophilic polymers of the present invention are synthetic or naturally chemically modified materials. Preferably, so-called water superabsorbents are used for preparing the binder, which are alkali, ammonium or other salts, copolymers and polymers of acrylic or methacrylic acid, such as, for example, the sodium ammonium salt of copolymers of acrylic acid with acrylonitrile in a ratio of 2: 1 or potassium ( sodium) a 4: 1 ratio of ethyl acrylate / acrylic acid copolymers. Cellulose derivatives such as carboxymethylcellulose and modified starches are also suitable.

The hydrophilic polymers may be used alone or in admixture. Preferably, those which form a resilient film of the aqueous solution after evaporation of the water are used for the binder, thereby increasing the anchoring of the pickling compositions on the seed grain surface.

Hydrophilic polymers have a dual function in the binder:

(a) In the technological process of seed dressing, it prevents the preparations from drying on the metal parts of the machinery.

(b) Upon incorporation of the contaminated seed into the soil, they have the ability to retain water from the surroundings in the immediate vicinity of the grain and to transmit this grain, thus improving and accelerating the germination process even in times of lack of moisture in the soil.

This dual function of the hydrophilic polymer in the binder is also a major criterion for determining its ratio to the dispersion polymer. The ratio is determined experimentally, while observing the application properties of the binder relative to the process equipment and the biological properties of the infested seed.

In terms of application, the binder has to meet a wide range of requirements. It must resist lowered temperatures to prevent deterioration at low temperatures below freezing. The film-forming temperature should be as low as possible so that it can also be used in the winter months when seed dressing is predominantly carried out. The prepared suspension of water, pickling agent and binder should not foam. The binder for long-term storage should be protected against the effects of microorganisms in order to prevent its deterioration. It must also ensure good wetting of the grain surface.

It goes without saying that polymeric substances alone cannot satisfy all the requirements and therefore additional components must be added to the binder in an amount to meet the respective requirement. This can be used:

- to lower the freezing point

(a) aliphatic alcohols having 1 to 8 carbon atoms;

b) mono-, di-, tri-, tetraethylene glycol

(b) mono-, di-, tri-, tetraethylene glycol,

(c) compounds whose molecule contains a polyethylene glycol group containing 5 to 50 basic ethylene glycol units;

(d) polyhydric alcohols and polyols;

(e) glycerin, sugars, tetroses, pentoses, hexo10 sy, heptoses and water-soluble polysaccharides;

(f) urea, - to reduce the minimum film-forming temperature by the means previously mentioned - to reduce the foaming of a conventional antifoam, preferably those which do not contain a silicone component - to suppress the action of microorganisms by conventional bactericidal preparations such as organic tin compounds; under the trade name Proxel, manufactured by ICI England, or by Do-wicide, manufactured by DOW-chemical England and others.

- Binders intended for application to seeds with a surface and hydrophobic properties, must contain suitable wetting agents. Anionic and non-ionic are useful, of which those having reduced foaming in aqueous solution are preferred. Non-ionic ones having a polyethylene oxide group in their molecule meet this requirement.

The binder of the present invention must have a pH of less than 9. It is known that when this value is higher, the germination of the seeds decreases sharply. This phenomenon is likely to directly affect the enzymatic processes that take place during the germination within the seeds, which break down the water-insoluble storage substances (starches, fats, proteins) to the lower water-soluble ones required in the germination process. It is therefore advisable to select individual components which are no longer alkaline in nature for binder preparation. If the final binder composition has a different pH value than desired, the pH adjustment of the acidic reagent must be performed. It is preferable to use organic acids of which the best results are obtained with citric acid.

The overall binder compositions of the present invention are shown in the following examples.

Example 1

A solution prepared from 450 parts by weight of water and 25 parts by weight of modified starch (trade name Oxamyl AL 11 TM), 5 parts by weight, is added with stirring to 150 parts by weight of dispersion copolymer of dibutyl maleate (commercial name Disapol CE 601). After mixing, 8 parts by weight of glycerol and 4 parts by weight of butyl glycol acetate are added. The pH of the citric acid solution is adjusted to a range of 5.5 to 6.5. The binder forms a film with a ductility of more than 400%.

Example 2

To 500 g of dibutyl phthalate-softened methyl methacrylate dispersion polymer (trade name Disapol M 1-40) was added 6 g of nonylphenol-1-polyethylene oxide ether with 9 groups of ethylene oxide (trade name Slovafol 909) and 4 g of nonylphenolpolyethylene oxide ether with 5 groups of words ethylene oxide ) and mix thoroughly. 200 g of ethyl acrylate solution copolymer with sodium salt of crystalline acid (commercial designation Socrat 20) is slowly added to the mixture by stirring, the components are homogenized and then 165 g of water and 25 g of ethanol are added with stirring. 100 g of a red dye (commercial name Versaprint red GRT) is added to the homogeneous mixture. The binder has a pH value of 6.7 and forms a film with a ductility of more than 300% after evaporation of water and alcohol.

Example 3

To 1000 g of a 50 wt.% Carboxylated styrene-butadiene dispersion is added 24 ml of a 50% ethoxylated higher alcohol solution (trade name Slovasol 3525 R), 100 g of saturated urea solution and 50 g of 80% glucose solution. After stirring, 900 g of a solution containing 60 g of hydroxyethylcellulose are added. (trade name Natro-sol 250 L), 0.1% by weight, based on the total weight of the binder of the fungicidal preparation (trade name Proxel ORL), is added and the pH is adjusted to 5.5 with citric acid solution. After evaporation of the water, the binder forms a film with an elongation above 600%.

Example 1 a d 4

To 400 g of methyl methacrylate-butyl acrylate dispersion copolymer (trade name Sokrat 6492) with a dry matter content of about 50% by weight is added 15 g of nonylphenolpolyethylene oxide ether with 20 groups of ethylene oxide (trade name Slovafol 920) and 5 g of nonylphenolpolyethyleneoxidethe.ru Slovafol 905) and 30 g of butyl glycol acetate, mix until the components have dissolved and the mixture is completely homogeneous. Then 130 g of water and 300 g of the sodium ammonium salt of acrylonitrile copolymer (Sokrat 44) are added and, after mixing, 80 g of isopropanol and 40 g of diethylene glycol are added and homogenized. 20 g. The binder has a pH of 7.1 and after evaporation of water and volatile components it forms a film with an elongation of approx. 300%.

Claims (1)

A composition for anchoring the active ingredients to the surface of the seeds, which in the aqueous medium contains a binder in an amount of 5 to 56 percent by weight, and one or more secondary ingredients, characterized in that the binder consists of a mixture of polymeric substances of which at least one is hydrophilic in an amount of 5 to 70% by weight, based on the total weight of the polymer, selected from the group consisting of copolymers comprising acrylic acid, methacrylic acid salts, cellulose derivatives, modified starches and the remaining polymer is at least one dispersion polymer selected from homopolymers; copolymers of esters of acrylic, methacrylic, styrene, butadiene, vinyl acetate.