JPH03163003A - Stabilizing agent and water suspended agricultural chemical - Google Patents

Abstract

PURPOSE:To obtain a stabilizing agent for water suspended agricultural chemical containing xanthane gum and sodium montmorilonite at a specific ratio and capable of stably suspending a solid active ingredient of agricultural chemical which is slightly soluble in water for a long period. CONSTITUTION:Xanthane gum and sodium montmorilonite are jointly used as a stabilizer for water suspended agricultural chemical at a ratio of the latter of 1-7 pts.wt. to the former of 1 pts.wt. Then about 0.2-3.2wt.% of the above- mentioned stabilizer is added to the above-mentioned agricultural chemical containing a solid active ingredient of agricultural chemical which is slightly soluble in water, nonionic surfactant and water to provide the aimed agricultural chemical suppressed in aggregation and separation of the above-mentioned active ingredient, capable of exhibiting good suspension stability also during long-term storage, having excellent re-dispersibility also after long-term storage and safely usable without any hindrance also when used as a spraying agent for controlling insect pest.

Description

Detailed Description of the Invention (Utilization of Industry-L) The present invention provides a stabilizing agent for suspending and dispersing a poorly water-soluble solid agricultural chemical active ingredient in water and preserving it for a long period of time, and a stabilizing agent containing the same. This invention relates to a water-suspended pesticide made by

Recently, there has been an increase in the use of cloudy a drug formulations (flowable agents), in which a high-strength 73 mulberry one active ingredient is suspended and dispersed in water. Much research has been done.

The basic method for obtaining a water-suspended agricultural plant is to pulverize the active ingredients of agricultural chemicals, which are sparingly water-soluble and solid at room temperature, and disperse them in water using an interfacial agent. However, the water-suspended J:S drug that is dispersed with surfactant +'t agents causes aggregation and separation of the pesticide's active ingredients during scooping, sometimes resulting in heart caking. There is. If the container is shaken lightly, it will be difficult to re-disperse it and it will no longer be usable as an agrochemical preparation.

In order to solve these problems, research is being carried out on ways to stabilize the viscosity of the dispersion system by adding various viscosity modifiers to the aqueous suspension. For example, non-ionic? l: A method using a superactive agent and a water-soluble polymer such as heteroborosatucharite (Japanese Patent Publication No. 53-46889), a method using a superactive agent mixed with xanthan gum (Japanese Patent Publication No. 57-5860 1) (Japanese Unexamined Patent Publication No. 63-830 No. 1, $4!). Method using surfactant cutting and hydrated aluminum silicate powder (JP-A-51-
Publication No. 79729). However, in general, increasing the viscosity impairs the ability of the suspension to be discharged from the container during use, and lowering the viscosity causes problems such as coagulation and sedimentation due to the effectiveness of the pesticide. Then again, the current situation is whether the reform is insufficient or not.

Problem to be solved by invention 7k9. The purpose of the present invention is to solve these problems and provide a water-suspended agricultural chemical with good suspension stability.

(Measures to Solve the Problems) The present inventors have conducted extensive research to solve the above problems. As a result, it was found that the effective amount of pesticides, which are poorly water-soluble and solid at room temperature, and the nonionic surfactants, xanthan gum and sodium montmorillonite (1 to 7
A water-suspended drug formulation consisting of the π1 positive part ゛, the combination (-r) and water has good suspension stability without causing aggregation or precipitation of the active ingredient even when stored for a long period of time. The present invention was perfected by discovering that it would maintain the same characteristics. The water-insoluble solid agricultural chemical active ingredient 7 used in the wood-based plant is not particularly limited, and can be used as long as it has a solubility in water of about 1% rat% or less at room temperature. For example, the following can be mentioned.

1 of soybeans 1 Tetrachloroisophthalonitrile (TPN), 3-allyloxy-1,2-penzointhiazole-1,1-silicate (probenasol), 4,5,6,7-tetrachlorphthalite (Fusalyton, (Z)-2'-methylacetophenone = 4,6-dimethylpyricin-2-ylhytoranane (felimson)
, N-(3.5-dichlorophenyl)-2-dimethylcyclopropane-1,2-cyclopropane-1,2-cyclopropane (procymitone) l-(4-chlorophenoxy)-3,3-dimethyl-1
- (1,2.4-1-riazol-l-yl)-2-
Tutanone (triacymefon), 1,2-bis(3-methoxycarbonyl-2-thiourate)benzene (thiophanate methyl), bis(dimethylthiocarhamoyl)cisulfite (thiuram), bismethylthiocarpamoyl zinc ethylene bisthiocarhamate (Polycarhamate), all-rac
- 1 - (biphenyl-4-yloxy)-3.3
-dimethyl-1- (IH-1.2.4-triazolyl>butan-2-ol (videltanol), basic copper chloride, basic copper sulfate, 6- (3.5-dichloro-4-methylphenyl)- 3
(2H) 1-pyridazinone (cyclomedine) 1.2.4-}-riasol-1-ylisothio J4
j2',4'-dichloroanilito S1P-chlorobenzyl ether, h, etc.

Hoshitori” 1 Hisuma 1- (3,5-dichloro-2,4-cyfluorophenyl)-3- (2,6-difluorobenzoyl) W
J (teflubenzuron) O,S-dimethyl-N-acetylphosphoroamitothiate (acephate), O. O-dimethyl 10-3.5.6-}-lichlor-2
-Viridy-phosphorothioate (chlorpyrifos-methyl), 3.5-xyly-N-methyl carhamate (XMC)
．． 2-chloro-1-(2,4.5-trichlorophenyl)
Vinyl dimethyl phosphate (CVMP) 1-naphthyl-N-methyl carbamate (NAC) Metatolyl-N-methyl carhamate (MTMC), O o,o-simethyl-7σ-(31 years old xo-2-phenyl-2H-pyritacin-6 -yl) phosphorothioate (
Viritafenthion》 2-isopropylphenyl-N-methyl carbamate (
MIPC), S,S-2-dimethylaminotrimethylene=cyclobenzenethiosulfonate (pensultap), 3-formyl-2-nitromethylenetetrahydro-28
-1,3-thiazine, etc. Nasei Seimu 1 3.4-Cyclolpropionanilito (propanyl), Methyl-N-(3.4-cyclolphenyl)carhamate (MCC), 3-isoprobyl-1.2.3-penzothiazinone-(
4)-2,2-Syoxide (bentazone), 4-Chlorotrioxy(thioacetate) S-ethyl (
Methyl α-(4,6-cymethoxypyrimidin-2-ylcarhamoylsulfamoyl) 10-toluate (bensulf[1-methyl)], 5-(2,4-cyclophenoxy) -2-methyl nitrobenzoate (bifenox), 2-(±-2- (4- (3,5-dichloropyricyl-21-oxyphenoxy)propianyl}inoxacin, ethyl-5- (3- ( 4.6-dimethoxybilicin-2-yl)ureitosulfonyl)-1-methylpyrazole-4-carboxylate (pyrazosulfuronethyl) 3.7-cyclo-8--8nolinecarboxylic acid (quinclorac), Such.

These (a) effects can be changed arbitrarily depending on the type of two or more types used, and for the time being, it is assumed that a water-suspended pesticide should contain 1 to 60% of its effectiveness. Can be used. Examples of nonionic surfactants that can be used in wood invention include the following, but the present invention is not limited to those exemplified here. Polyoxyethylene alkyl allyl ether, polyoxyethylene styrenated phenyl ether polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyalkylene glycol polyoxyethylene styrenated phenyl ether polymer, etc. The amount of surfactant added varies depending on the properties and concentration of the agricultural chemical active ingredient, but is generally 0.5 to 151% by weight, more preferably 1 to 10% by weight. They can be used alone or in combination of two or more, and may also be used in combination with anionic surfactants. The xanthan gum that can be used in the present invention is
Xantho*onas Casp
It is a polysaccharide produced by a small cow named esL-risl. Its constituents are crucose, mannose and curcuronic acid. In addition, there are systematic minerals that can be used in the present invention, and their chemical composition (ideal formula) is generally based on Nan. :
+:+(^l +.ay+lllgo zz)SiJ+
o(Oll) tnll20 gets 71 mi. And the addition κ of xanthan gum and sodium montmorillonite is
The effectiveness of the drug may vary depending on the properties and concentration used, but it is necessary to use Socium Montmolyte at a ratio of 1 to 7 parts xanthan gum to 1 part part of xanthan gum.
The total amount of xanthan gum and sodium montmorillonite added varies depending on the type and amount of active ingredients and surfactants, or is approximately 0.2
The viscosity of the water-suspended pesticide may be adjusted appropriately to 1200 cps or more, which is convenient for discharging the formulation from the container. In this case, xanthan gum lr@! If a wood turbidity agent is prepared by adding 11 of sodium montmorillonite to . Severely damaged and undesirable.

In preparing the water-suspended agricultural mulberry of the present invention, it is necessary to use commonly used antifreeze agents such as ethylene glycol, cyethylene glycol, propylene glycol, and glycerin. p-chloromethaxylenol,
There is no problem in using antifungal agents such as p-chloromethacresol, ρichisai xian, tutyl sulfate, sorbic acid, potassium sorbate, silicone antifoaming agents, and the like.

Example 1: The method for producing the water-disturbing pesticide of the present invention does not require any special method or equipment, and may be a conventional method for producing a wood suspension. For example, add 0.0% of the above nonionic surfactant to water.
After adding and dissolving the acid in the range of 5 to 15%, mix the slightly water-soluble solid pesticide active ingredient that has been roughly ground and finely ground, xanthan gum aqueous solution, and sodium montmorillonite aqueous solution at a ratio of -4 liters as described above. In addition, the
000~10000rpm. tlf is 7
If you mix the mixture for about 20 minutes at around 0 0 0 rpm,
Book 3? ! The water in the river is said to be contaminated with pesticides.

In addition, the active ingredient of Pesticide I1 was developed by Jet11, ahead of Sengawa.
-mi/. CR (manufactured by Seishin Enterprise Co., Ltd.), etc., or 1 Tino mill (Willy 8.lla)
It is preferable to use one obtained by mixed pulverization using a grinder (manufactured by Chofen AG) or the like to finely pulverize medium-sized grains (f) to about 0.1 to 3 gm.

Next, examples of the present invention will be described.
The present invention is not limited to these examples. All parts in the examples are expressed as r(i 11) parts.

Length K Example L Wood 5L. Dissolve 3 parts of styrenated phenyl ether (nonionic interfacial agent) and 5 parts of ethylene glycol in 9 parts of polyoxyethylene (415 mol), and mix with Jet-0-mizer to give an average particle size of 3 gm.
20 parts of fusarite (a poorly water-soluble agricultural chemical active ingredient) finely ground in
3% aqueous solution of sodium montmorillonite to! ! It
Add 0.1 part of silicone and three-fun motor (
After mixing with Tomi 11 Photo Film (manufactured by Co., Ltd.), it was mixed with a TK homomixer at 7000 rpm for 20 minutes.
Stir and mix for 1 minute to obtain a water-suspended pesticide.

55.8 parts of Natsuo Fumiyu water, boroxyethylene (20 mol), sorbitan laurate (non-ionic agent)
4? Dissolve S and 5 parts of propylene glycol, 15 parts of Procymitone (slightly water-soluble solid pesticide effective), 5 parts of 2% xanthan gum aqueous solution, 15 parts of 3% sodium monsolylonite aqueous solution, 0. Add 1 part of silicone and 0.1 part of silicone, mix uniformly with a three-one motor, mix with a dyno mill until the average particle size of the agricultural chemical active ingredient is about 1 to 2 Bm, and grind it. Obtain a tree-like pesticide.

'χk Example 3 36.4 parts of water was added with polyoxyethylene (98-f:l)nonylphenyl ether ('ionic field + r + i /
CVMP which was dissolved in 0.5 parts of polyoxyethylene (24 cells), 5 parts of styrenated phenol (the same), and finely pulverized with a Jet-0-sizer.
(Poor water-soluble solid drug active ingredient) 50 parts, 2% aqueous solution of xanthan gum 4FfB. Add 4 parts of a 3% aqueous solution of sodium montmorillonite and 0.1 part of silicon, mix uniformly with a suso one motor, and then
Stir and mix for 20 minutes at 7000 rps using a κ homomixer to obtain a uniform water-aqueous pesticide.

(Function) In the wood invention, by mixing xanthan gum and sodium monomorillonite in a specific ratio, it is possible to prevent water-disturbing agricultural chemicals containing solid pesticide ingredients that are poorly soluble in water during storage. Acts as an effective suspension stabilizer.

Test examples will be given to prove the usefulness of the present invention.

The water suspension @ka (
The physical properties of the products of the present invention and comparative examples) were measured by the following method. 1) Viscosity Measured using a Type 2 B viscometer (manufactured by Tokyo Keiki Co., Ltd.). The conditions are: rotor NO2, rotor I
-How many rotations 12rp snow liquid a! The temperature was 25℃. 2) Wood prepared for formulation stability test! ! Contains j'FA type pesticides 130
30 m in a test tube of m (17 ■■ φ x length 180 mm)
1, close the cap tightly and let it stand. After 3 months at 20'C and 3 months at 50°C, the sample was kept in a separated state. 3) Redispersibility test: Pour 450 m of water-suspended pesticide into a 500 mi volume bolibin, and place at 50 °C. After 3 months in C, check for the presence of sediment at the bottom of the container, and if there is sediment, shake the container vigorously to disperse it, pass it through a 250 mesh sieve, and remove the remaining dispersed material in sieve L. It was estimated based on the following evaluation.

0 - No sieve residue 8 sieve residue 6 low κ - sieve residue Seita IJ (Effect of the invention) In the present invention, xanthan gum and sodium montmorillonite are mixed in a specific ratio to form a water suspension agricultural formulation. By adding it, it is possible to stabilize the suspension during storage over a long period of time without causing any agglomeration or separation of the active ingredients.

Claims (1)

[Scope of Claims] 1) A stabilizer for water-suspended agricultural chemicals, characterized in that it contains 1 to 7 parts by weight of sodium montmorillonite per 1 part by weight of xanthan gum. 2) Slightly water-soluble solid pesticide active ingredient, nonionic surfactant, xanthan gum, sodium montmorillonite (
1-7 parts by weight per 1 part by weight of xanthan gum) and water.