JPH0369321B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an agrochemical composition for spraying, and in particular, by mixing agrochemical components with a synthetic resin emulsion having a specific composition, the agrochemical components are dispersed by wind, etc. during spraying. The purpose is to prevent the pesticide components from being dispersed into the area and to fix the pesticide components on the plants. (Conventional technology) When spraying pesticides such as powders, they tend to scatter into nearby fields, houses, livestock barns, ponds, etc. other than the target field due to the influence of wind, etc. Such scattering of pesticides is not only an economic disadvantage in terms of losses. This has a negative impact on the surrounding environment, and also causes insufficient pest control effects. As a solution to this problem, attempts have been made to formulate powders into granules or granules, but if the powders are made into granules, their adhesion to plants will naturally be significantly reduced, and wind, rain, etc. Therefore, it is easily washed away and scattered, and in this case as well, there is a disadvantage that a sufficient pest control effect cannot be obtained. On the other hand, regarding insecticides, fungicides, repellents, and other fumigants that vaporize through evaporation or sublimation,
It is already known that the effect is not temporary and is maintained evenly over a relatively long period of time by being formulated into a granular formulation, but in this case, the granular formulation It can be easily washed away by wind and rain at the appropriate height and appropriate part of the plant.
The important issue is to ensure stable adhesion to prevent scattering. (Structure of the Invention) The present inventors have conducted intensive studies in consideration of the disadvantages of the conventional methods, and have found that a mixture of a specific synthetic resin emulsion described later is easy to spray with a general spraying device and does not adhere to plants. The present invention was completed by confirming that the pesticides are reliable, do not scatter or wash away due to wind and rain, and that the effects of vaporizable pesticides are sustained on plants for a long period of time. The agricultural chemicals targeted by the present invention include powdered,
It includes various forms such as granular, liquid, and even those that have been formulated in advance for sustained release.There are also no particular restrictions on the active ingredients of agricultural chemicals, and they generally include insecticides, fungicides, and pesticides. Nematodes, herbicides, rodenticides, plant growth regulators, repellents, attractants,
Examples include fumigants. Next, the synthetic resin emulsion used in the present invention includes (a) 99 to 70% by weight of one or more esters of acrylic acid or methacrylic acid or vinyl acetate, and (b) 0.5 to 15% by weight. , acrylic acid,
1 of methacrylic acid or glycidyl acrylate
species or two or more species, and (c) 0.5 to 15% by weight,
It is obtained by emulsion copolymerization of one or more of vinyl sulfonic acid, styrene sulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, or their salts, and can be mixed with various agricultural chemicals. The various effects described above can be achieved. Monomers corresponding to component (a) include methyl, ethyl, propyl, i-propyl, n-butyl, i-butyl, and t-acrylic acid and methacrylic acid.
-butyl, hexyl, cyclohexyl, 2-ethylhexyl, lauryl, stearyl, oleyl,
Esters such as ethoxyethyl or benzyl,
and vinyl acetate. Furthermore, as the monomer corresponding to component (b), acrylic acid, methacrylic acid, and glycidyl acrylate are used. Furthermore, examples of monomer components corresponding to component (iii) include vinylsulfonic acid, styrenesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, and their sodium, potassium, or ammonium salts. The monomers of component (a), component (b) and component (c) described above may be used alone or in combination of two or more. The usage ratio of the above components during emulsion copolymerization is:
It is required that component (a) be 99 to 70% by weight, component (b) 0.5 to 15% by weight, and component (c) 0.5 to 15% by weight. The emulsion copolymerization method may be a general method, and various anionic, nonionic, and cationic surfactants are used as emulsifiers, and potassium persulfate, ammonium persulfate, hydrogen peroxide, or A redox catalyst containing a combination of these peroxides and a reducing agent is used. In addition,
In the emulsion polymerization system, chain transfer agents, buffering agents,
Polymerization aids commonly used in emulsion polymerization, such as inorganic salts, may be added. The emulsion copolymer emulsion obtained in this way has a solid content, that is, a Tg of the polymer component of -10°C.
Desirably, the temperature is between -60°C, and if the ratio of each component used and the Tg are out of the ranges described above, the desired adhesion (adhesive force) may not be exhibited. In addition, when this emulsion copolymer emulsion is mixed with agricultural chemicals, it is preferable that the solid content concentration is 5% by weight or more. If it is less than this, the viscosity of the spraying liquid will not be sufficient and the dispersion stability of the agricultural chemicals will decrease, resulting in spraying. Trouble may occur during this process, or the pesticide may not be able to adhere to the plant. There is no particular restriction on the pH of the emulsion copolymerization emulsion, but it is desirable to use it within a range that does not cause any phytotoxicity to plants, that is, a pH of 6 to 8. Regarding the mixing ratio of agricultural chemicals and synthetic resin emulsions, the appropriate ratio is determined by the type and form of the agricultural chemicals as well as the type of synthetic resin emulsion, solid content concentration, etc., so it cannot be discussed uniformly, but usually It is desirable that the solid content of the synthetic resin emulsion be 0.2 to 2 parts by weight and the water component be 1 to 20 parts by weight per 1 part by weight of the agricultural chemical. Note that the synthetic resin emulsion has adhesive properties,
In order to further improve adhesiveness, a thickener such as water-soluble cellulose ether, polyvinyl alcohol, polyacrylic acid, etc. may be used in combination. The method of spraying the agrochemical composition of the present invention may be any suitable method such as mechanical spraying or aerial spraying depending on the application site, scale, etc., and there are no particular restrictions on the spraying means. Furthermore, since the composition according to the present invention is an aqueous liquid, it can be easily sprayed using a simple general sprayer such as a backpack type sprayer equipped with a driving force and a discharge nozzle, and is easy to handle even for ordinary farmers. It's not a struggle. Next, specific examples will be given. Example 1 A synthetic resin emulsion was produced as follows. Synthetic resin emulsion (1): In a reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen gas inlet tube, 2-ethylhexyl acrylate 70 parts by weight Vinyl acetate 20 methacrylic acid 9 2-methyl 2-acrylamide Sodium propane sulfonate 1 Polyethylene glycol nonyl phenyl ether (HLB17) 2 Sodium lauryl sulfate 0.5 Ammonium persulfate 0.2 Water 100% and stirred in a nitrogen stream at 70°C.
A time emulsion copolymerization reaction was carried out. The mixture was then cooled and adjusted to a pH value of 6 to 7 with aqueous ammonia to obtain a stable synthetic resin emulsion free of coarse particles.
This product has a solid content of 50%, a pH of 6.2, a viscosity of 200 centiboads (25°C, Burdskfield viscometer),
The Tg value was -38.3°C. Next, we prepared granules with an average particle size of 0.4 mm containing diazinon as an active ingredient as a pesticide.
A pesticide composition for spraying was prepared by mixing 100 parts by weight of the above synthetic resin emulsion and 500 parts by weight of water. This agrochemical composition was loaded into a backpack-type power spreader (model PD-703E-13) manufactured by Kyoritsu Co., Ltd., and spread at a distance of 2 m on a polyethylene sheet measuring 1 m x 1 m fixed at an angle of 45° from the horizontal. The adhesion rate was determined from the number of diazinon granules that adhered to the polyethylene sheet and the number that fell without adhering to the polyethylene sheet. Adhesion rate during spraying = a/a+b×100 (%) a: Number of adhered granules b: Number of fallen granules In addition, after spraying and drying at 25°C for 5 hours, approximately 50% of the diazinon granules adhered to the surface When water was sprinkled for 1 hour or 3 hours under the conditions of 1 min/m ² , the number of remaining particles attached to the initial number of particles attached was examined, and the adhesion rate after watering was determined. Adhesion rate after watering = a'/b' x 100 (%) a': Number of adhered granules after watering b': Number of adhered granules before watering The results were as follows. Adhesion rate during spraying: 99% Adhesion rate after watering 1 hour after watering: 98% 3 hours after watering: 96% Examples 2 to 6 Synthetic resins having the following composition and properties in the same manner as synthetic resin emulsion (1) Emulsion (2)
~(6) was obtained. Synthetic resin emulsion (2): (Monomer composition) 2-ethylhexyl acrylate 80 parts by weight Methyl methacrylate 10 Glycidyl acrylate 5 Sodium styrene sulfonate 5 (Properties) Solid content = 52%, PH = 6.8 , Viscosity = 100 centipoise (25℃), Tg = -50.6℃ Synthetic resin emulsion (3): (Monomer preparation composition) Butyl acrylate 64 parts by weight Methyl methacrylate 32 parts by weight Methacrylic acid 3 〃 2-Acrylamide 2- Sodium methylpropanesulfonate 1 〃 (Properties) Solid content = 50%, PH = 6.2, Viscosity = 350 centipoise (25℃), Tg = -14.8℃ Synthetic resin emulsion (4): (Monomer preparation composition) Acrylic acid 2-Ethylhexyl 90 parts by weight Acrylic acid 6 Sodium styrene sulfonate 4 (Properties) Solid content = 51%, PH = 6.2, Viscosity = 400 centipoise (25℃) Tg = -60℃ Synthetic resin emulsion (5): ( Monomer charge composition) 2-ethylhexyl acrylate 70 parts by weight Vinyl acetate 16 〃 Methacrylic acid 7 〃 Sodium vinylsulfonate 7 〃 (Properties) Solid content = 48%, PH = 6.3, Viscosity = 300 centipoise (25℃) , Tg=-40.4℃ Synthetic resin emulsion (6): (Monomer preparation composition) Butyl acrylate 99 parts by weight Acrylic acid 0.5 〃 Sodium 2-acrylamide 2-methylpropanesulfonate 0.5 〃 (Properties) Solid content = 49% , PH = 6.6, viscosity = 50 centipoise (25°C), Tg = -54°C Next, 100 parts by weight of diazinon granules similar to those used in Example 1, 100 parts by weight of any of the above synthetic resin emulsions, and 500 parts by weight of water. Each composition was prepared by mixing the following parts. When the adhesion rate (%) during spraying and the adhesion rate (%) after watering (1 hour after watering and 3 hours after watering) were measured for these in the same manner as in Example 1, the results shown in Table 1 were obtained. It was done.

[Table] Comparative Example 1 In Example 1, vinyl acetate resin emulsion [Konishi Co., Ltd.] was used instead of synthetic resin emulsion (1).
Spraying experiments were conducted in the same manner except that Bond CH-18] (manufactured by BOND CH-18) was used at the same rate. The adhesion rate at the time of spraying was 98%, but the adhesion rate after 1 hour of watering was
The adhesion rate is as low as 22%, and the adhesion rate after 3 hours of watering is 1%.
Most of it fell off or was washed away, and did not exhibit sufficient adhesion. Example 7 The composition prepared in Example 1, consisting of diazinon granules and synthetic resin emulsion (1), was
Residual adhesion rate (%) one month after spraying on apple trees of m
) was investigated. The number of rainy days during this test period was 5.
The adhesion rate after being left for one month was 88%, indicating good adhesion performance. Comparative Example 2 The same spray composition as in Comparative Example 1 was sprayed on apple trees in parallel with the test in Example 7, and the residual adhesion rate after one month was examined. The adhesion rate after the first rainy day was already low at 38%, and after being left for one month, most of it had fallen off and did not show sufficient adhesion.

Claims (1)

[Claims] 1 Pesticide ingredients, (a) 99 to 70% by weight of one or more esters of acrylic acid or methacrylic acid or vinyl acetate, (b) 0.5 to 15% by weight,
one or more types of acrylic acid, methacrylic acid or glycidyl acrylate, and (c) 0.5~
A pesticide for spraying comprising 15% by weight of a synthetic resin emulsion obtained by emulsion copolymerization of one or more of vinylsulfonic acid, styrenesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, or their salts. Composition.