JPH01157903A - Dispersant composition for agricultural chemical wettable powder - Google Patents

Abstract

PURPOSE:To obtain an economical water-soluble dispersant composition for agricultural chemical wettable powder, by adsorbing a surfactant on a granular starch hydrolyzate used as a carrier for the agricultural chemical wettable powder. CONSTITUTION:A dispersant composition for an agricultural chemical wettable powder obtained by adsorbing a surfactant [preferably in an amount of 50-120 pts.wt. based on 100 pts.wt. granular starch hydrolyzate (preferably having <=about 30 dextrose equivalent and containing >=30wt.% granular grains having >=80 mesh grain size) ] on the granular starch hydrolyzate. The granular starch hydrolyzate is obtained by spray-drying or drying a starch hydrolytic solution in a drum dryer. The granular starch hydrolyzate used herein has a great specific surface without inhibiting fluidity of the agricultural chemical wettable powder by adsorbing a large amount of the surfactant. The agricultural chemical wettable powder containing the above-mentioned composition is poured into water and dissolved in water to completely dissolve the surfactant in water. Effects thereof are completely exhibited.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a dispersant composition for a granular agricultural chemical wettable powder that is easily soluble in water.

[Conventional technology and its problems]

(Prior art) Pesticide hydrating agents are mainly composed of agricultural chemical active ingredients, clay minerals such as montmorillonite, and surfactants, and are easy to handle, and are suitable for agricultural chemical raw materials that cannot be emulsified due to the lack of suitable solvents. It is widely used today because it has the advantage that it can be used even in agricultural chemical ingredients that cannot be fluidized due to crystal precipitation over time. In the above, when a 7-ionic surfactant such as a formalin condensate of sodium naphthalene sulfonate, a sodium alkylbenzene sulfonate, or a sodium sulfate ester of a higher alcohol is used as a dispersant, the melting point of the surfactant is Since it is expensive, it can be easily powdered by adding water-soluble inorganic salts such as Glauber's salt and ammonium sulfate. However, nonionic surfactants (e.g., polyoxyethylene alkylaryl ether, polyoxyethylene/polyoxypropylene block polymers, etc.) and anionic surfactants (e.g., polyoxypropylene block polymers, etc.), which are generally used as dispersants for wettable powders, In order to powder sulfuric acid ester ammonium salts of oxyethylene alkylaryl ethers, phosphoric acid esters of polyoxyethylene alkyl ethers, etc.), hydrous silicic acid (Si), which has a large oil absorption capacity, is usually used.
02.nH2O; often referred to as white carbon or silica) is used. (Problems with conventional technology) By the way, although hydrated silicic acid has excellent oil-absorbing ability, it does not dissolve in water itself, so when a powdered product with a surfactant adsorbed to it is placed in water, it does not dissolve into the water. The surfactant eluted remains at 30 to SOS at most. Therefore, when using a nonionic surfactant or anionic surfactant as a dispersant for wettable powders, in order to expect sufficient dispersion ability, add more than the required amount of surfactant based on the amount of adsorption. This resulted in a need to increase the price.

[Purpose of the invention]

The present invention provides a novel dispersion for agricultural chemical hydrating powders that eliminates the drawbacks of conventional hydrated silicic acid by selecting a starch hydrolyzate that has never been used as a carrier for agricultural chemical hydrating powders. The purpose of the present invention is to provide a drug composition.

[Means to achieve the purpose]

(Summary) In order to achieve the above objects, 1 the dispersant composition for agrochemical wettable powders according to the present invention is such that the surfactant is spray-dried or drum-dried.
It is characterized in that it is adsorbed onto a granular V powder hydrolyzate dried in a dryer, preferably a starch hydrolyzate having a dextrose equivalent (DE) of 30 or less. Below, various elements constituting the invention will be explained. (Starch hydrolyzate) The starch hydrolyzate used in the present invention includes potato,
It is obtained by reducing the molecular weight of starch obtained from sweet corn, wheat, etc. by a conventional method, such as enzymatic decomposition or acid decomposition, and then drying it using a spray dryer or drum dryer. To describe a specific method, for example, 100 parts of water and 30 parts of starch are added to a reaction vessel, and powdered α-amylase is added thereto, and the temperature is maintained at 50°C while stirring. When the desired DE hydrolyzate is obtained, caustic soda is added to inactivate α-amylase, and neutralized with acid to obtain a slurry-like fermented flour hydrolyzate. It is desirable that the dextrose equivalent (DE) of the decomposition product is 30 or less. Next, the slurry of the above hydrolyzate was heated to an ambient temperature of 80°C to 80°C using a spray dryer or drum dryer.
By drying at 150° C., a granular starch hydrolyzate having a sieve size of 30% or more is obtained, which is suitable for carrying out the present invention. (Surfactant) Examples of the surfactant used in the present invention include nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyalkylaryl ether, polyoxyethylene/polyoxypropylene fist block polymer, and polyoxyalkylene fatty acid ester. Activators, such as polyoxyalkyl ether sulfates, polyoxyalkylaryl ether sulfates, alkyl sulfates, polyoxyalkyl ether phosphates, polyoxyalkylaryl ether phosphates, dialkyl sulfosuccinates, etc. Anionic surfactants can be mentioned, but of course the surfactants are not limited to one example. These surfactants can be used alone or in a mixture of two or more. (a) Method for preparing a dispersant for agrochemical powders of the present invention, for example,
The granular starch hydrolyzate is placed in a ribbon mixer or Nauta mixer, and the surfactant is injected while stirring to mix uniformly. At this time, if necessary, 50-80℃
May be heated to (Other additives) In the present invention, as required, fluidity improvers such as Glauber's salt, ammonium sulfate, ammonium chloride, glucose, and urea can be added.

[Effect]

The coarse starch hydrolyzate used in the present invention has a large specific surface area, adsorbs a large amount of surfactant and does not impede the fluidity of the composition (agrochemical hydrating agent), and the agrochemical containing the composition of the present invention. When the hydrating agent is added to water, the V-powder hydrolyzate itself dissolves in water, so the surfactant adsorbed to the hydrolyzate completely dissolves in water and fully exhibits its effect. In addition, the dissolved material has a moderate viscosity derived from starch hydrolyzate and has an adhesive effect on the target plant.
The effects of pesticides can be maximized.

【Example】

Hereinafter, the embodiments and effects of the present invention will be explained in detail using experimental examples and comparative examples, but the idea of the present invention is not limited to these examples. Experimental Example ~ 1 Starch hydrolysates with various DEs using Hytenol NF-13 (trade name of sulfuric acid ester ammonium salt of polyoxyethylene alkylaryl ether manufactured by the applicant company), which is a dispersant for wettable powders. The adsorption capacity was measured. The term "adsorption capacity" as used herein means the amount of Hytenol NF-13 adsorbed until the starch hydrolyzate loses its fluidity. (Margin below) Table 1 Actual) 1 pull ≦ 100 parts of Carplex #80 (trade name of hydrated silicic acid manufactured by Shionogi & Co., Ltd.) was adsorbed with 100 parts of Hitenol NF-13. The solubility in water was compared with sample No. 7 in Table-1. The results are shown in Table 2 below. <Measurement method> Weigh 5g of the above sample into a 100ml beaker,
Add 95 g of water and stir with a stirrer. The supernatant liquid is suction filtered using a glass filter (3G-4) at each measurement time. 1 glass filter
Dry at 05°C for 1 hour and determine the water-insoluble content. (Leaving space below) Table 2 Prepare the NAC (1-naphthyl-N-methylcarbamate) irrigation agent shown below and add Hytenol NF-13t to sample N007 and Carplex 180,100 parts in Table 1.
A comparative test was conducted on a dispersant that adsorbed the oo portion. The results are shown in Table 3 below. 1) Blend formula NAC bulk 50 Zikrite C35 Radiolite 200 15-x 2) Sample preparation method Mix in a ball mill for 2 hours, 80 milliliter, all through. 3) Test method (1) Based on the official testing method for hydrating pesticides (using 5° hard water). (2) Take 0.5g of the suspension ratio sample in a beaker, thoroughly disperse it with a small amount of water, and use a 250+sJl graduated cylinder (inner diameter 3.8cm).
φ) and 250 tsl with 5° hard water (water temperature 20°C).
Then do a handstand up and down 30 times. After standing still for 30 minutes, the upper part 22
Extract 5 ■ sentences and pass the remaining 251 sentences through a glass filter (
After filtering with 3G-4) and drying. Find the suspension rate using the formula below. (The following is a blank space) Table 3 From the suspension ratio section in Table 3 above, it is clear that 5z of the dispersant had to be added in the conventional product, but it is sufficient to add 1 to 2z of the dispersant in the product of the present invention.

【Effect of the invention】

As explained above, the present invention is a new economical product that eliminates the drawbacks of conventional hydrous silicic acid by selecting a starch hydrolyzate that has not been used as a carrier for agricultural chemical wettable powders. By providing a dispersant composition for agrochemical wettable powders, the present invention can contribute to agriculture, horticulture, and related industries. Patent applicant Daiichi Kogyo Seiyaku Co., Ltd.

Claims (6)

[Claims] (1) A dispersant composition for an agrochemical wettable powder, characterized in that a surfactant is adsorbed on a granular starch hydrolyzate. (2) Dextrose equivalent of granular starch hydrolyzate (
The dispersant composition for agrochemical wettable powders according to claim 1, wherein DE) is about 30 or less. (3) Claim 1 in which the granular starch hydrolyzate contains 30% or more of granules with a size of 80 mesh or more.
The dispersant composition for agrochemical hydration powders according to item 1 or 2. (4) 5 parts per 100 parts by weight of granular starch hydrolyzate
The dispersant composition for an agrochemical wettable powder according to claim 1, 2 or 3, which contains 0 to 120 parts by weight of a surfactant. (5) The dispersant composition for an agrochemical wettable powder according to any one of claims 1 to 4, wherein the granular starch hydrolyzate is obtained by spray-drying a starch hydrolyzate. (6) The dispersant composition for an agrochemical wettable powder according to any one of claims 1 to 4, wherein the granular starch hydrolyzate is obtained by drying a starch hydrolyzate using a drum dryer. .