JPH02279610A - Dispersing agent for bordeaux mixture - Google Patents

Abstract

PURPOSE:To obtain the subject dispersing agent, containing a carboxyl- containing (co)polymer as an active ingredient and capable of readily preparing a homogeneous Bordeaux mixture having a fine particle diameter. CONSTITUTION:A dispersing agent for a Bordeaux mixture containing a homopolymer of a carboxyl-containing vinyl compound, e.g. (meth)acrylic, itaconic or maleic acid, or a copolymer thereof with other vinyl compounds as an active ingredient. The amount of the abovementioned dispersing agent added is 0.01 to 20wt.%, preferably 0.1 to 5wt.% based on solid substances in the Bordeaux mixture and the addition period thereof is not especially specified. Thereby, the Bordeaux mixture, excellent in stability of dispersed particles and capable of exhibiting stable properties with a low viscosity even if the concentration thereof is increased can be prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a dispersant for Bordeaux liquid for obtaining a uniform Bordeaux liquid with fine particle size.

℃Prior art] Bordeaux liquid has been traditionally used for many years as an insecticide and fungicidal pesticide for various agricultural crops including apples, pears, and grapes.

Bordeaux liquid is not only cheap, but also because there is a trend to avoid accumulating organic chlorine pesticides, which have become a problem in recent years.

Traditionally, this Bordeaux liquid is prepared by separately making an aqueous solution or dispersion of the raw materials copper sulfate and quicklime, and then
For example, this is done by mixing an aqueous copper sulfate solution with a lime emulsion while stirring while cold. The mixing ratio of copper sulfate and quicklime varies depending on the purpose of preventing pests and bacteria, but in any case, the dispersion obtained by mixing and reacting as described above is sprayed onto agricultural crops.

Techniques related to the preparation and spraying of Bordeaux liquid include, for example, Japanese Patent Application Laid-Open Nos. 51-44629 and 52
-38371, etc., and in order to obtain a long-term stable Bordeaux liquid, for example, Japanese Patent Application Laid-Open No. 53
JP-A-52622 discloses the use of a protective colloid agent such as genin sulfonate.

[Problem to be solved by the invention]

However, the quality and stability of Bordeaux liquor are greatly affected by the way the lime emulsion is made and the way this emulsion is mixed with the copper sulfate aqueous solution, and it is difficult to obtain a uniform Bordeaux liquor with fine particle size using the above-mentioned known techniques. is not easy and requires considerable skill. When the particle size becomes large, it is difficult to spread onto crops when sprayed, and it easily washes off when it rains, or it settles in the spray liquid container, clogging the nozzle and causing uneven concentration. This makes uniform dispersion difficult.

In view of the above, an object of the present invention is to provide a dispersant for Bordeaux liquid that enables the preparation of uniform Bordeaux liquid with fine particle diameters and also contributes to stabilizing and increasing the concentration of dispersed particles. .

[Means to solve the problem]

As a result of intensive studies to achieve the above object, the present inventors found that when a specific compound is added and mixed as a dispersant during the preparation of Bordeaux liquid, a uniform Bordeaux liquid with fine particle size can be obtained. The present invention was completed based on the knowledge that the dispersed particles have excellent stability and exhibit stable properties with low viscosity even when the concentration is high.

That is, the present invention provides a dispersion for Bordeaux liquid containing a homopolymer or copolymer of a carboxyl group-containing vinyl compound, a copolymer of a carboxyl group-containing vinyl compound and another vinyl compound, or a salt of these polymers as an active ingredient. This is related to drugs.

[Structure and operation of the invention]

The carboxyl group-containing vinyl compound used in the present invention includes acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, or alkali metal salts thereof;
Ammonium salt, alkyl ester having 1 to 20 carbon atoms,
Alternatively, alkylene oxide adducts such as ethylene oxide adducts and propylene oxide adducts may be mentioned.

In addition, other vinyl compounds that can be copolymerized with the above-mentioned carboxyl group-containing vinyl compound in the present invention include:
Ethylene, propylene, bucdiene, isoprene, 2-
Methyl-1-butene, 1-hexene, isobutylene, diisobutylene, 1-dodecene, styrene, p-methylstyrene, isopropyl vinyl ether, butyl vinyl ether, isopropenyl methyl ether, vinyl acetate,
Examples include acrylamide.

The amount of these other vinyl compounds used is preferably 80% by weight or less, particularly preferably 60% by weight or less, based on the total amount with the carboxyl group-containing vinyl compound. If too much is used, it will be difficult to obtain the effects of the present invention.

In the present invention, homopolymers or copolymers of the above carboxyl group-containing vinyl compounds, copolymers of the above carboxyl group-containing vinyl compounds and other vinyl compounds (
Hereinafter, these polymers are collectively referred to as carboxyl group-containing polymers) or salts of these carboxyl group-containing polymers are used as the active ingredient of a dispersant for Bordeaux liquid.

As such carboxyl group-containing polymers, any of those obtained by various known synthetic methods can be used, and the molecular weight can be set appropriately depending on the type of each polymer, but generally the weight average molecular weight is i, ooo ~ Those within the range of soo and ooo are preferably used. Further, as the salt, in addition to alkali metal salts and ammonium salts, lower amine salts such as ethanolamine salts can also be used.

Specific examples of carboxyl group-containing polymers or salts thereof used in the present invention include sodium polyacrylate, potassium polymethacrylate, sodium salt of a copolymer of maleic acid and styrene, and sodium salt of a copolymer of maleic acid and styrene. Ammonium salt of a copolymer with isobutylene, potassium salt of a copolymer of methacrylic acid and methyl methacrylate, sodium salt of a copolymer of itaconic acid and 2-hydroxyethyl acrylate, copolymer of crotonic acid and acrylamide. Sodium salt of polymer, ammonium salt of copolymer of ethylene oxide (5 moles) adduct of methacrylic acid and acrylic acid, copolymer of ethylene oxide (10 mole) adduct of maleic anhydride and allyl alcohol with methyl ether and so on.

In the present invention, the amount of the carboxyl group-containing polymer or its salt added to the Bordeaux liquid is usually 0.01 to 20% by weight, preferably 0.1 to 5% by weight based on the solid content of the Bordeaux liquid. It is better to do so. If the amount used is too small, the effect of the present invention will not be sufficiently obtained, and if the amount used is too small, no further significant difference will be observed, which is economically disadvantageous.

In the present invention, the time of addition of the carboxyl group-containing polymer or its salt is not particularly defined, and it may be added in advance to copper sulfate or an aqueous solution of copper sulfate, or it may be added to quicklime, slaked lime, or an aqueous dispersion thereof. It may be added to the Bordeaux liquid, or it may be added after the Bordeaux liquid is prepared.

In addition, when preparing the Bordeaux liquid of the present invention, an appropriate surfactant can be used as necessary in addition to the above-mentioned carboxyl group-containing polymer or its salt. Examples of such surfactants include "Surfactant Handbook" (published by Sangyo Tosho Co., Ltd.) edited by Nishiichi, and "Elucidation of the functional effects of new surfactants and their applied products" edited by Soft Giken Publishing Department. A wide variety of well-known surfactants are included, such as those described in "Development and Practical Comprehensive Technical Data Collection" (Management Development Center Publishing Department).

In addition to the above-mentioned surfactants, known additives such as various alkali agents such as sodium silicate and sodium phosphate, chelating agents, and preservatives may be used in combination.

〔Effect of the invention〕

As described above, by using the dispersant containing the specific carboxyl group-containing polymer or its salt as an active ingredient of the present invention, it is possible to easily prepare a uniform Bordeaux liquid with fine particle size, and the stability of the dispersed particles can be improved. It is possible to prepare a Bordeaux liquor which exhibits excellent properties with low viscosity and stable properties even when the concentration is high.

(Examples) Next, examples of the present invention will be described in more detail.

EXAMPLES The carboxyl group-containing polymers or salts thereof shown in Table 1 were used as dispersants for Bordeaux liquids of sample grades 1 to 8 of the present invention, and each dispersant was used in the following preparation method A.

Two types of Bordeaux liquors were prepared using B.

Table 1 shows the amount of dispersant used in both preparation methods A and B based on the solid content of Bordeaux liquid after preparation! (weight%)
I made it so that

<Preparation method A> Copper sulfate (Cu SOa ・5 Hz O) 4
g dissolved in 12 ml of water and 12 g of quicklime dissolved in 4
Prepare samples dispersed in 8ml of water, and prepare samples N111~
A lime emulsion was first dispersed in 940 ml of water in which a predetermined amount of each of the dispersants No. 8 had been dissolved with stirring, and then an aqueous copper sulfate solution was added dropwise little by little to prepare a Bordeaux liquid.

<Preparation method B> 12g of quicklime at 30mA! After adding a predetermined amount of each dispersant in sample list 1 to 8 to the dispersant in water, copper sulfate (
A solution of 4 g of CuSO4.58zO) dissolved in 12 mj' of water was added dropwise little by little with stirring to prepare a highly concentrated Bordeaux liquid having a concentration of about 25% by weight.

For each of the two types of Bordeaux liquids prepared in this way, stability evaluation tests and particle size measurement tests were conducted as described below. The results are shown in Table 1 together with the results for the example Bordeaux liquid.

Stability Evaluation Test> 9 Pour Bordeaux liquid into a 100ml Bordeaux measuring cylinder with a stopper made by A until the scale of the cylinder reaches 100.
After putting on a stopper, the mixture was shaken vigorously 10 times to mix, then allowed to stand. After 30 minutes, the scale of the sedimentation layer was read, and the higher the number, the more stable the mixture was.

9 Wealth 1 Bordeaux by method B! Pour Bordeaux liquid into an OOmJ mayonnaise bottle and leave it for a month, then gently stir with a glass rod (when stirring,
Those in which a low-viscosity dispersion was obtained again were evaluated as ○, and those in which the dispersion did not return to its original state even after slight stirring were evaluated as ×.

Particle Size Measurement Test> The average particle size of each Bordeaux liquid prepared by Preparation Methods A and B was measured using a Microtrack (manufactured by Nikkiso).

As is clear from the results in Table 1 above, when the dispersant of the present invention is used, not only a uniform and stable Bordeaux liquid with a small particle size can be obtained in a dilute solution, but also a highly concentrated Bordeaux liquid can be easily obtained. It can be seen that a soft-backed liquid that can be redispersed is obtained, whereas such a Bordeaux liquid cannot be obtained in the comparative example in which no dispersant is used.

Claims (1)

[Claims] (1) A dispersant for Bordeaux liquid containing a homopolymer or copolymer of a carboxyl group-containing vinyl compound, a copolymer of a carboxyl group-containing vinyl compound and another vinyl compound, or a salt of these polymers as an active ingredient.