JPS61167602A - Extender for granular agricultural chemical - Google Patents

Abstract

PURPOSE:To provide an extender for granular agricultural chemicals containing CaCO3 as an essential component, capable of remarkably improving the dispersibility of the granular agricultural chemicals in water by synergistic effect, and containing a water-soluble salt of a specific copolymer and a specific anionic surfactant at a specific ratio. CONSTITUTION:The objective agent contains (A) a water-soluble salt of a copoly mer of isobutylene or diisobutylene and maleic acid or maleic anhydride and (B) a sulfate-type, sulfonate-type or phosphate-type anionic surfactant such as sodium laurylsulfate, diethanolamine salt of a laurate, sodium salt of polyoxyethylene nonylphenyl ether sulfate, etc., at a weight ratio (A/B) of 9/1-3/7. The extender is added to a granular agricultural chemical in an am ount of 0.1-10wt%. EFFECT:An excellent effect can be attained by the combined effect of the dispersibility of CaCO3 originated from the structure of the copolymer and the wettability and dispersibility of the anionic surfactant.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spreading agent for agricultural chemical granules, and more specifically, it significantly improves the water spreadability of agricultural chemical granules that essentially contain calcium carbonate as an extender. This invention relates to an improved extender for pesticide granules.

[Conventional technology]

Danzan * II * 2!111 In order to fully demonstrate the medicinal effect and to simplify and rationalize the application, emulsions, aqueous solutions, powders, wettable powders, For practical use, granules are formulated into layers suitable for each purpose.

Among these agent layers, granular pesticides play an important role in saving labor in pest and weed control systems, and can be applied safely, conveniently, and with little loss. It is a rational agent layer that has been widely applied to pesticides, insecticides, nematicides, etc.

Ordinary granules maintain their granule shape without collapsing against applied pressure or impact during product inventory and transportation, and when applied to the field, they easily disintegrate and expand upon contact with water, and contain It is necessary to quickly elute the pesticide active ingredient.

For this reason, conventional general granular pesticides contain various pesticide active ingredients as active ingredients, inorganic mineral powders such as bentonite, talc, clay, and kaolin as carriers, and starch, polyvinyl alcohol, gelatin, and CMC as binders.
It is made into granules by adding sodium alginate, etc.

Since the granules obtained by these methods have poor spreadability in water as they are, a method has been proposed in which a carboxylic acid polymer is used as a spreading agent (Japanese Patent Publication No. 1501/1981).

[Problem that the invention seeks to solve]

However, in recent years, calcium carbonate has been used as an inorganic carrier to prevent caking during long-term storage, to prevent screen abrasion during granulation, and to prevent decomposition of active ingredients in granulated particles. The situation was such that satisfactory disintegration and spreadability could not be obtained with the spreading agent. In other words, the use of conventionally disclosed polycarboxylic acid type homopolymers or copolymers of styrene, vinyl acetate, etc. with acrylic acid, methacrylic acid, or maleic anhydride alone is insufficient for pesticide granules containing calcium carbonate as an essential component. It is not possible to provide extensive extensibility.

[Means for Solving the Problems] Therefore, the present inventors conducted extensive research in order to obtain a spreading agent that provides excellent disintegration and spreading properties even for pesticide granules containing calcium carbonate as an essential filler. As a result, using a specific carboxylic acid polymer that was previously unknown as an extender,
Furthermore, the inventors have discovered that by using a specific surfactant in a specific ratio, the water dispersibility of pesticide granules containing calcium carbonate as an essential filler can be significantly improved, and the present invention has been completed.

That is, the present invention provides (a) a water-soluble salt of a copolymer of isobutylene or diisobutylene and maleic acid or maleic anhydride, and an lbl sulfate-based, sulfonate-based, or phosphate-based anionic surfactant in a weight ratio of Dea/b
The present invention provides a spreader for agricultural chemical granules, characterized in that the spreader is contained in a ratio of =9/1-3/7.

The water-soluble salt of the copolymer of isobutylene or diisobutylene and maleic acid or maleic anhydride used in the present invention is produced by a known method. For example, diisobutylene and maleic anhydride are copolymerized in an organic solvent. It is then obtained by hydrolysis with an alkaline aqueous solution.

The copolymerization ratio of isobutylene or diisobutylene and maleic acid or maleic anhydride is 2/8 to 8/2, preferably about 1/1.

Isobutylene and diisobutylene may be a mixture,
Maleic acid and maleic anhydride may also be a mixture. In addition to the above components, a third heptadmer may be added and copolymerized within a range that does not impair the effects of the present invention; The proportion should be below 50 mol%, preferably below 20 mol%.

Examples of water-soluble salts include alkali metal salts such as sodium and potassium salts, alkaline earth metal salts such as magnesium, and ammonium salts such as ammonia, triethanolamine, and jetanolamine. Alternatively, a mixture of these may be used.

(b) Sulfate-based, sulfonate-based or phosphate-based anionic surfactants used in the present invention include alkyl (carbon numbers 8 to 20) sulfates, polyoxyalkylene alkyl (carbon numbers 8 to 20), and polyoxyalkylene alkyl (carbon numbers 8 to 20).
20) Ether sulfate, polyoxyalkylene alkyl (4 to tS) aryl ether sulfate, polyoxyalkylene styrenated phenol ether sulfate, polyoxyalkylene phenylphenol ether sulfate, polyoxyalkylene tribenzylated phenol ether sulfate Examples of sulfonates include alkyl (4 to 16 carbon atoms) benzenesulfonate, dialkyl sulfosuccinate, naphthalene sulfonic acid formalin condensate, alkylnaphthalene sulfonate or its formalin condensate, formalin condensate of creosote oil sulfonate, Alkyl (4 carbons
~16) Diphenyl ether sulfonate, α-olefin (carbon number 8 to 20) sulfonate, etc. Phosphates include alkyl (carbon number 8 to 20) phosphate, polyoxyalkylene alkyl (carbon number 8 to 20) ether phosphate, polyoxyalkylene Alkyl (
Examples include phenyl ether phosphate (having 4 to 16 carbon atoms). Two or more of these anionic surfactants may be used in combination.

(The ratio of al component and (b) component is (a)/fb by weight)
)=9/l to 3/7, preferably 8/2 to 6/4
It is. Outside this range, the remarkable effects of the present invention cannot be obtained.

The extender of the present invention is 0.1 to 10% by weight based on the pesticide granules.
, preferably 0.5 to 5% by weight.

There are no particular limitations on the raw biocide in the granules in which the extender of the present invention is used, and it can be adsorbed to white carbon, etc., as well as biocide in the form of a paste or solid at room temperature, or even a liquid biocide. Can be used. It may also be a mixture of two or more biocides.

The extender for pesticide granules of the present invention is for granules having calcium carbonate as an essential component as an extender, but other inorganic carriers such as clay, diatomaceous earth, etc. may be blended. The effect of the expanding agent is remarkable for granules containing 30% by weight or more, preferably 50% by weight or more of calcium carbonate.

The component ratio of pesticide granules using the extender for pesticide granules of the present invention is usually as follows.

Pesticide raw material 1-30% by weight (a) Copolymer salt 0.1-1O/! (b) Activator
0.1~1O〃Calcium carbonate 50~98
．． 8 /1 Others (inorganic carrier, etc.) 0-48.8
Furthermore, there are no particular limitations on the granulation method.

It can be granulated using a general extrusion granulator.

[Fist action effect]

The spreader for pesticide granules of the present invention has the above structure, that is, due to the mutual effect of the specific copolymer and the specific anionic surfactant, the dispersion of calcium carbonate derived from the structure of the copolymer is particularly advantageous. It is thought that the remarkable effects of the present invention are brought about by the combination of the properties of the anionic surfactant and the wettability and dispersibility of the anionic surfactant, but the details are not clear.

〔Example〕

The present invention will be explained in more detail by giving examples, granulation examples, and test examples below.

Example 1 Sodium lauryl sulfate l Calcium carbonate 87 CNP raw material
10 // Comparative Example 1 Soda salt of copolymer of isobutylene and maleic anhydride 2% (wt) Calcium carbonate 88〃GNP raw material
IQ // Comparative Example 2 Sodium lauryl sulfate 1% (wt) calcium carbonate 88 // GNP raw material
10//Example 2 Soda salt of copolymer of isobutylene and maleic anhydride 1% (wt) Die of lauryl phosphate 1 //Tanolamine salt Calcium carbonate 83〃 to IPC raw material 5〃MIPC:o-
Cumenyl methyl carbamate Comparative Example 3 Soda salt of copolymer of isobutylene and maleic anhydride 1% (wt) Calcium carbonate 94 MIPC raw material 5 // Comparative example 4 Calcium carbonate 92 Old PC raw material
5 // Comparative Example 5 Calcium Carbonate 917/Old PC Raw Material 5 Comparative Example 6 Calcium Carbonate 91 MIPC Raw Material 5 Example 3 Soda salt of copolymer of diisobutylene and maleic anhydride 2% (wt) Calcium carbonate 871 /NAC raw material 101/NAIC: 1-naphthyl-N-methyl-carbamate Example 4 Formalin condensate of salt of calcium carbonate 56/l
−
3Q/fNAC drug substance
10 Comparative Example 7 Calcium Carbonate 881/NAC Raw Material 10//Comparative Example 8 Calcium Carbonate 56//Rishi
−
30% (wt) NAG bulk
10. Granulation Example Among the components shown in Examples 1 to 4 and Comparative Examples 1 to 8, the liquid raw materials were adsorbed on white carbon in equal weight ratios in advance. In addition, the solid material used was one that had been coarsely ground in advance.

The above drug substance 1 The extender of the present invention and an inorganic substance such as calcium carbonate were uniformly mixed, water was added, and the mixture was granulated using an extrusion type granulator to obtain granules.

Test Example 1 Water (3 degree hard water) in a Petri dish with a diameter of 15 cm and a depth of 2 cm
1 g of the above granules was gently placed in the center of the Petri dish, and the area of expansion over time was determined. The results are shown in Table-1.

Table-1

Claims (1)

[Scope of Claims] (a) a water-soluble salt of a copolymer of isobutylene or diisobutylene and maleic acid or maleic anhydride; and (b) a sulfate-based, sulfonate-based or phosphate-based anionic surfactant. , A spreading agent for agricultural chemical granules, characterized in that it contains a/b in a weight ratio of 9/1 to 3/7.