JPS644482B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to an agrochemical powder that significantly suppresses electrostatic charging to the jet tube of a sprayer during spraying. More specifically, when spraying pesticide powders such as powders, DL (driftless) powders, and coarse powders (unless otherwise specified, these are collectively referred to as ``agrochemical powders'') with a backpack-type power spreader, A new agricultural chemical powder capable of suppressing or preventing static electricity generated in direct injection pipes made of insulators such as, etc., which is made by blending magnesium oxide (MgO) as an antistatic agent with agricultural chemical active ingredients and a mineral powder carrier. The present invention relates to providing an agrochemical powder characterized by the following. The purpose of the present invention is to reduce the spark discharge that occurs between the spray pipe and the pesticide applicator when the charged potential becomes abnormally high due to the accumulation of static electricity generated in the spray pipe during spraying. The purpose is to prevent the strong electric shock that sprayers receive by making improvements to the pesticide powder itself. Magnesium oxide used in the present invention is generally used in refractory materials, magnesia cement materials, rubber, pharmaceuticals, etc., but so far there has been no example of its use in agricultural chemical powders. That is, the present invention provides a completely new method of using magnesium oxide. The mechanism by which direct injection pipes are electrostatically charged when spraying pesticide powder is not clear, but it is generally believed that electric shocks (sparks) occur when the absolute value of the charged potential exceeds 30KV. Therefore, when this electric shock occurs when spraying agricultural chemical powder, the sprayer receives a strong shock to his/her body, causing considerable fear for the sprayer. This electric shock has a high voltage but a small current, so it does not directly affect human life, but it is a problem because it can lead to secondary disasters. In order to protect sprayers from the fear and disaster caused by such electric shocks, many researches have been made to develop new technologies to prevent static electricity during pesticide spraying. For example, a method of spraying an antistatic agent (trade name "Denkyl-TS") consisting of a special cationic surfactant ("Agricultural Mechanization Research Institute Report", 1972)
Research on antistatic agents for multi-mouthed hose jets (March 2013), Method of using white carbon as an antistatic agent, which is used as an auxiliary agent in the preparation of agrochemical powders [Pesticide Production Technology, No. 25, p. 9 (1971) )],
A method for preventing static electricity by adding 3% or more of calcium carbonate powder or 10% or more of calcium sulfate to a pesticide powder containing clay as a main carrier
129129), an antistatic method by adding 5% or more of talc to an agrochemical powder containing calcium carbonate powder as a main carrier (Japanese Patent Application Laid-open No. 129128/1983),
Various antistatic methods include adding fatty acids, oxyfatty acids, arylsulfonic acids, higher alkylarylsulfonic acids, or their salts to pesticide powders containing calcium carbonate powder as the main carrier (Japanese Patent Application Laid-Open No. 55-57501). methods are being tried. However, even with these techniques, charging cannot be sufficiently suppressed, and depending on the antistatic agent added, there are problems such as having an adverse effect on the decomposition of agricultural chemical active ingredients. Therefore, it is desired to develop a new and effective antistatic technique to replace these conventional techniques. In view of these circumstances, the present inventors have conducted extensive research. As a result, by simply adding magnesium oxide to pesticide powder, it is possible not only to completely eliminate electric shock to the sprayer, but also to have excellent effects such as having no adverse effects on the various active ingredients. This discovery led to the completion of the present invention. The agrochemical powder of the present invention has no inconveniences not only during spraying but also during production and storage, and can be a new and useful antistatic powder. In preparing the agrochemical powder of the present invention, there is no need for any special method or equipment; the powder, DL powder, or coarse powder can be produced by adding magnesium oxide using a commonly used manufacturing method. good. Further, the amount of magnesium oxide added in the present invention is not particularly limited, and an excellent antistatic effect can be obtained if it is 0.01% or more by weight in the agricultural chemical powder, but 0.05% from the viewpoint of effectiveness and economical efficiency. ~
5.0% (by weight) is preferred. Furthermore, even if more than this is added, the same excellent antistatic effect can be obtained. In the present invention, if necessary, magnesium oxide as an antistatic agent and the following antistatic agents may be mixed and used within the scope of the purpose of the present invention. Typical examples include basic magnesium carbonate, magnesium hydroxide, zinc oxide, aluminum oxide, titanium oxide, calcium borate,
Nickel hydroxide, carbon black, metal salts of stearic acid (Ca, Zn, Mg, etc.), synthetic gypsum, calcium silicate, soybean oil, cottonseed oil, olive oil, zircon silicate, tricalcium phosphate, calcium dihydrogen phosphate, calcium dihydrogen phosphate monohydrate, calcium monohydrogen phosphate, calcium monohydrogen phosphate dihydrate, lower fatty acids, lower oxyfatty acids, acetic acid, oxalic acid, boric acid, succinic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid or its alkali metal salts,
Examples include alkaline earth metal salts, ammonium salts, lower alkylamine salts, and alkanolamine salts. The total amount of the antistatic agent of the present invention and the mixture of these antistatic agents is 0.01%.
(weight) or more, the desired antistatic effect can be obtained. The mineral powder carrier used in the present invention may be any carrier that is normally used in agricultural chemical powders, such as clay, talc, bentonite, kaolin, diatom, and the like. The particle size of these carriers is in addition to those used in normal pesticide powders, so-called DL (driftless) clay or cut, which has a particle content of 10μ or less and 20% (weight) or less, and an average particle size of 20μ or less. (Cut) Clay can also be used. The agrochemical active ingredient used in the present invention is not limited in any way, and any insecticide, fungicide, plant growth regulator, or mixture thereof that can be used in the form of a powder can be used. Examples of this are as follows. The active ingredient names of pesticides are based on the common names in the "Pesticide Handbook 1981 Edition" (published by the Japan Plant Protection Association). First of all, insecticides include CYAP, MPP, MEP,
ECP, diazinon, isoxathion, pyridafenethion, chlorpyrifos methyl, marathon, PAP, dimethoate, mecarbam, thiometone, phosalone, PMP, prothiophos,
CVMP, dimethylvinphos, CVP, propaphos,
Organophosphorus compounds such as DEP, EPN, CYP, EPBP, NAC, MTMC, MIPC, BPMC, PHC,
Carbamate compounds such as MPMC and XMC, benzoepines, pyrethrins, rotenone, kelsen,
Various compounds include chlorbenzilate, chlorpropylate, chinomethionate, cartap, methomyl, chlorphenamidine, and the like. In addition, disinfectants include inorganic copper agents (basic copper chloride, basic copper sulfate, basic copper phosphate sulfate, cupric hydroxide), organic copper (oxine copper), inorganic sulfur, zineb, organic sulfur nickel salts. , organic arsenic agent (MAF),
TPN, fusaride, IBP, EDDP, blasticidin S, kasugamycin, polyoxin, validamycin A, PCNB, eclomesol, triphenyltin hydroxide, captan, phenazine oxide, DPC, dichlofluanid, anilazine,
Examples include various compounds such as thiophanate methyl, isoprothiolane, and phosdaifene [0-ethyl 0,0-(2,4-dichlorophenyl) phosphate]. In addition, in the present invention, adjuvants such as physical property improvers and stabilizers for active ingredients, which are normally used when formulating agrochemical powders, can be used without adversely affecting the expression of the antistatic effect of the present invention. Even if I do, I can't help it. Examples are given below to specifically explain the present invention, but the present invention is not limited to these examples. In addition, all parts in the examples mean parts by weight. Example 1 (Powder) 0.3 parts of validamycin A, 0.2 parts of isopropyl acid phosphate (physical properties improver), 1.0 part of white carbon, 0.1 part of magnesium oxide and 98.4 parts of clay were added and mixed by pulverization with an atomizer to obtain a powder. Ta. Example 2 (Powder) 2.0 parts of BPMC, 2.0 parts of Cartap, 0.2 parts of isopropyl adophosphate, 2.0 parts of white carbon
1 part, 0.5 parts of magnesium oxide, and 93.3 parts of clay were mixed by grinding with an atomizer to obtain a powder. Example 3 (DL powder) Chlorpyrifos methyl 2.0 parts, isopropyl acid phosphate 0.2 parts, liquid paraffin 1.0
part, white carbon 1.0 part, magnesium oxide
0.1 part and 95.7 parts of DL clay were added and mixed by pulverization using an atomizer to obtain a DL powder. Example 4 (DL powder) 2.0 parts of phosdaifene, 0.1 part of kasugamycin hydrochloride (hereinafter simply referred to as kasugamycin), 0.2 parts of isopropyl acid phosphate, 1.0 parts of liquid paraffin, 1.5 parts of white carbon, 0.3 parts of magnesium oxide, and 94.9 parts of DL clay. was added and mixed by pulverization using an atomizer to obtain a DL powder. Example 5 (DL powder) 1.5 parts of XMC, 1.5 parts of NAC, 0.2 kasugamycin
Add 0.4 parts of MAF, 0.2 parts of isopropyl acid phosphate, 1.0 parts of liquid paraffin, 1.0 parts of white carbon, 0.5 parts of magnesium oxide, and 93.7 parts of DL clay, and grind and mix with an atomizer.
A powder was obtained. Example 6 (DL powder) 4.0 parts of DEP, 1.5 parts of EDDP, 0.2 parts of isopropyl acid phosphate, 1.0 part of liquid paraffin, 1.0 parts of white carbon, 0.5 parts of magnesium oxide and 91.8 parts of talc were added and mixed by pulverization using an atomizer. A DL powder was obtained. Example 7 (coarse powder) TPM 4.0 parts, polyvinyl alcohol 1.0 parts,
Add 1.0 part of white carbon, 0.3 part of magnesium oxide, and 93.7 parts of clay, pulverize and mix with an atomizer, add 5.0 parts of water, granulate with a rolling granulator, dry, and sieve to produce 65 to 250 mesh pieces. A coarse powder was obtained. Example 8 (Coarse powder) 2.0 parts of MEP, 2.5 parts of isoprothiolane, 1.0 parts of polyvinyl alcohol, 2.0 parts of white carbon,
After adding 0.7 parts of magnesium oxide and 91.8 parts of clay and pulverizing and mixing with an atomizer, 5.0 parts of water was added and granulated with a rotary granulator, dried and sieved to obtain a coarse powder of 65 to 250 mesh. Obtained. Test Example 1 Static electricity was measured in the following manner. (1) Measuring device Connect a direct injection pipe (made of vinyl chloride with an outer diameter of 60 mm, wall thickness of 1 mm, and length of 423 mm) to a backpack-type power spreader (Kyoritsu DM-9AE model), and adjust the height of the spreader. It was placed on a 1 m wooden pedestal, and the connecting part of the sprayer and the direct injection pipe was fixed with a stand so that the direct injection pipe was 1 m above the ground. Then, a recorder (Kasuga Denki 401K) was used to measure the charged potential at the center of the direct injection pipe.
Type) connected to a current collector potential measuring device (Kasuga Denki)
KS-325 type) was installed. (2) Measurement method: Put 3 kg of pesticide powder manufactured according to Examples 1 to 6 into a backpack-type power spreader, set the throttle lever for adjusting the engine rotation to 9/10, and open the lever for adjusting the powder discharge amount. It was sprayed with an opening degree of 6/10. Then, the charged potential at the center of the direct injection tube when spraying was measured. The measured value was obtained by reading the electric potential recorded in the powder from a chart every 5 seconds, and was expressed as the average value. On the measurement day, the reference powder was always sprinkled, and the charged potential of the sample powder was measured after confirming that there was no abnormality in the measured value of the charged potential. The results are shown in Table 1.

【table】

【table】

[Table] Tables 2 and 3 show the results of testing the stability over time of the pesticide active ingredients in the pesticide powder of the present invention.
As shown in the table, the addition of magnesium oxide as an antistatic agent did not have any adverse effect on the stability of the agricultural chemical active ingredient. A test example will be shown regarding this point. Test Example 2 80g of pesticide powder (DL powder) having the composition shown in Tables 2 and 3 was packed into a 100ml glass bottle.
After storing in a thermostatic chamber (45°C) for 30 days, the decomposition rate of the pesticide active ingredient was determined using the following formula. The analytical values for the active ingredient content were determined by a colorimetric method for BPMC and MEP, by gas chromatography for PAP and Validamycin A, and by a bioassay method for kasugamycin. Decomposition rate (%) = (Analysis value of pesticide active ingredient content after 30 days at 1-45℃/Analysis value of pesticide active ingredient content immediately after production) x
100 The results are shown in Tables 2 and 3.

【table】

[Table] When the stability of active ingredient compounds other than those listed above was investigated, as shown below, the decomposition rate of each active ingredient was extremely low, and there was no adverse effect at all due to the addition of the antistatic agent in the present invention. i.e. chlorpyrifos methyl 1.1-2.0%, DEP 0.7-1.2
%, Propaphos 1.8-2.2%, Marathon 7.0-10
%, XMC is 0.7-1.1%. The agrochemical powder of the present invention can suppress the decomposition rate of the active ingredient to 1/2 to 1/20 or less compared to comparative powders containing CaCO ₃ or CaSO ₄ as an antistatic agent, and is comparable to general powders. It was used in the same way as pesticide powder without any problems.

Claims (1)

[Claims] 1. An agrochemical powder comprising an agrochemical active ingredient, a mineral powder carrier, and magnesium oxide as an antistatic agent.