JPS6058722B2 - Pesticide coating agent with good rain resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agrochemical coating agent with good rain resistance, which is characterized by containing alpha starch as a coating film forming agent.

The term "coating agent" as referred to in the present invention refers to an agrochemical preparation that is applied to trees to exhibit effects such as sterilization, insecticidal, repellent, and sun protection for trees. Conventional coating agents are made by diluting the active ingredient or white filler with a carrier, and adding film-forming agents such as acrylic resin, chlorinated rubber, petroleum resin, vinyl acetate, polyvinyl alcohol with a high saponification value, and latex emulsion. It is made into a paste preparation by dispersing it in an organic solvent or water.

For example, JP-A-47-38432 discloses that white fillers such as chalk, lime,
A method is disclosed in which a dispersed suspension of a film-forming polymer comprising titanium dioxide or the like and a synthetic polymer compound such as an acrylic resin or a polyolefin is applied by a roller, brush, spray, or the like. Also, JP-A-52-38
No. 025 contains water-soluble polymer compounds such as methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, gum tragacanth, gum arabic, and polyvinyl alcohol with a low saponification value as a coating film forming agent, and active ingredients, carriers, and adjuvants are mixed and ground. A powdered agricultural chemical formulation is described, which is prepared by diluting the obtained product with an appropriate amount of water and kneading it thoroughly before use, and then applying it with a brush, brush, etc. However, in the former formulation, organic and inorganic acid salts of basic compounds commonly used as active ingredients, such as 9-azoniaheptadecane, are used.
Diguanidium triacetate (DF-125),
Methyl-2-benzimidazole carbamate hydrochloride (
When a resin emulsion is blended with MBC-HCl), 2-(4-thiazolyl)benzimidazole hydrochloride (TBZ-HCl), etc., the coating film shows no rain resistance, and even in the latter case, the coating formed after application Membranes have the disadvantage of being easily washed away by rain, and it has been difficult to maintain the effectiveness of the active ingredients for a long period of time.

As a result of various studies to solve these problems, the present inventors have found that the coating film formed by the coating agent obtained using α-starch as a coating film forming agent is difficult to wash away due to rain, and it has been found that It has been found that the effects of germicidal dispersal, insecticidal, repellent, sun protection, etc. can be sustained for a much longer period of time than the film-forming agents described above.
The α starch used in the present invention is a β starch obtained by adding water and heating it, or by adding a sodium hydroxide solution, a concentrated salt solution, etc. to colytize it. Powder obtained by rapidly dehydrating and drying the coagulated liquid is also good.

In particular, this powder has excellent storage stability, and a colyzed liquid can be obtained by simply adding cold water as needed. The appropriate amount of alpha starch to be added is 1 to 3% by weight in the coating agent.

If it is less than 1%, the rain resistance will be weak, and if it is more than 30%, the rain resistance of the coating will improve, but the viscosity of the coating suspension will increase, making coating work difficult, so it is not economical. 30
It is preferable to stop at around %.

The production of the agrochemical formulation for application of the present invention is extremely simple;
Manufactured using any of the following common methods:

(1) For suspension coatings, the active ingredient, white filler, α
A mixture of starch, auxiliary agent and water is wet-milled, or an aqueous solution of alpha starch and auxiliary agent are added to and mixed with the active ingredient and white filler finely pulverized by wet or dry milling. (2) In the case of a powder coating agent, the active ingredient, white filler, alpha starch, carrier, and auxiliary agent are mixed and ground. Examples of active ingredients include DF-125 and MBC.
-HCI. ．． T■-HCllbis(dimethylthiocarbamoyl)disulfide (TMTD), 3-hydroxy-5-methylisoxazazole (Tatigarun), N-tetrachloroethylthio-4-cyclohexe,-1,2-dicarboximide (Difortan), etc. Bactericide; 0,0
-diethyl-0-(5-phenyl-3-isoxazolyl) phosphorodioate (isoxathion), 0,0-dimethyl-0-(3-methyl-4-nitrophenyl) phosphorothioate! -(MEP), 0,0-diethyl S-
Insecticides such as (2-ethylthioethyl)phosphorodithioate (ethylthiometone) and r-BHC; repellents such as cycloheximide and β-naphthol may be used alone or in combination.
It is used by mixing more than one species.

Examples of white fillers include clay, talc, kaolin,
Finely powdered materials such as ziecrite, bentonite, white earth, calcium carbonate, and shirasu are preferred, and in the case of powdered coating agents, they can also be used as carriers.

Furthermore, decomposition inhibitors, preservatives, thickeners, and resin emulsions such as vinyl acetate resin, which do not impair the effects of the coating agent of the present invention; methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone, etc. A water-soluble polymer compound or the like may be added.

In the case of a suspension coating, a small amount of ethylene glycol, sodium sulfate, etc. may be added as an antifreeze agent. The present invention will be further explained below with reference to Examples, Reference Examples, and Test Examples.

(In the text, all parts simply refer to parts by weight.) Example 1 Attritor (manufactured by Mitsui Miike Seisakusho, MA-1S type), DF-1255 parts, MBC-HCl'S), Siegrite nozzle Part, Movinyl DM2l ((vinyl acetate resin emulsion manufactured by Hoechst Synthesis Co., Ltd.) 3(2), Amicol H (
2 parts of α-starch (Nippon Kagaku Co., Ltd.) and 41 parts of water were charged, and the two powders were mixed and pulverized to obtain a viscous suspension coating.

This product can be applied directly using a brush or brush, or diluted with water and sprayed using a sprayer. Example 2 DF-1252 parts and TBZ-HCl9 in a ribbon mixer
Carplex #80 (Shionogi & Co., Ltd. product name)
3 parts of Amicol H, 8 parts of Amicol H, and 1.78 parts of G-Cry were mixed for 2 minutes, and then pulverized with an atomizer to obtain a powder coating agent.

Add twice the amount of water and stir to make a paste.
Apply with a brush, brush, etc., or dilute with 4 times the amount of water and spray using a sprayer. Example 3 Titanium dioxide w part in ribbon mixer, Carplex #80
3 parts of Siegrite, 77 parts of Siegrite, and 1 part of AMYCOL were added, the two powders were mixed, and then ground using an atomizer to obtain a powder coating agent.

This product is applied to trees in the same manner as in Example 2 and used as a sunscreen. Example 4 Add r-BI (C3 part, Carplex #) to the ribbon mixer.
803 parts, Amycol HlO part and Siegrite 84
After mixing for 3 minutes, the mixture was pulverized with an atomizer to obtain a powder coating agent.

This product is used in the same manner as in Example 2. Test Example 1 In order to investigate the rain resistance of various film-forming agents, a suspension coating agent obtained in the same manner as in Example 1 with the following formulation was applied to a roughened cedar board surface using a brush. After drying for about 24 hours, it was immersed in water and the flow of the paint film was observed.

We measured the number of sunsets required for the paint film to almost completely wash away.
The results are shown in Table 1←-6, Test Example 2 In order to investigate rain resistance, a powder coating agent obtained in the same manner as in Example 2 with the following formulation was mixed with twice the amount of water, and the same as in Test Example 1 was prepared. Similarly, it was applied to a cedar board and after drying for about 24 hours, its wash-off resistance in water was examined.

The results are shown in Table 2. Example 3 except that the coating agent of Example 3 according to the present invention and the formulation of Example 3 except that the Amicol H part was removed and the same weight of the following film forming agent was added instead.
The reference example coating agents obtained in the same manner as above were mixed with twice the amount of water to make a paste, and then applied to an apple tree (2@
The main branch of a Japanese (raw, Okada) tree with a diameter of approximately 10C771 was selected and coated on the entire surface.

The application was carried out in mid-March, and observations were continued after that to determine the number of days required until the coating film was washed away and the sun protection effect could no longer be expected. The results are shown in Table 3. Reference examples Coating film forming agent 1 Movinyl Powder SA (Hoechst Synthesis Co., Ltd., modified vinyl acetate resin powder) 2 Movinyl Bauder M (
Hoechst Synthesis Co., Ltd., vinyl acetate resin powder) 3 Celogen WS-A (Daiichi Kogyo Seiyaku Co., Ltd., carboxymethyl cellulose sodium salt) 4 Gohsenol GL-05 (
Nippon Gosei Kagaku Co., Ltd., polyvinyl alcohol) 5 Privalin (Nippon Gosei Kagaku Co., Ltd., esterified starch) From the above results, it can be seen that the rain resistance of the coating film of the present invention is extremely remarkable.

Although Privalin was found to have some rain resistance, this level is insufficient to expect sun protection effects throughout the season. Test Example 4 In order to confirm the sustainability of the efficacy of the applied insecticide of the present invention, a test was conducted to prevent Citrus chinensis from biting Citrus mandarin oranges.

Each drug was tested in 1 plot of 3 pots of 4-year-old Satsuma mandarin oranges.
The product was obtained in the same manner as in Example 4, except that Amycol H1(2) was removed from the powder coating agent of Example 4 according to the present invention and the formulation of Example 4, and the same weight of the following film forming agent was added instead. On July 10th, the powdered liniments of the reference examples were mixed with twice the amount of water and applied to the trunk of the tree up to a height of 30 cm from the ground using a brush. Separately, they were placed in a 3.3 d mesh room (using a 5 T f Un mesh).Five adult female Citrus mantis were collected from the field on July 20th, August 1st and August 10th. The animals were released in a screened room containing a tree.

In October, areas where wood chips were generated (areas where larvae were eaten) were investigated from the rice-coated area.

Separately, precipitation from July 10th to August 20th was also recorded. The results are shown in Table 4. Reference examples Film forming agent 6 Movinyl Powder SA (above) 7 Celogen WS-A (above) 8 Prevalin (above)

Claims (1)

[Claims] 1. A pesticide coating agent characterized by containing α-starch.