JPS60222402A - Agricultural chemical carrier - Google Patents

Abstract

PURPOSE:An agricultural chemical carrier, consisting of composite powder of calcium carbonate-silicic acid having a specified specific surface measured by the BET method and oil absorption, and capable of stably supporting a large amount of agricultural chemical active constituent and keeping the activity of the active constituent for a long period. CONSTITUTION:An agricutural chemical carrier consisting of composite powder of calcium carbonate-silicic acid having >=60m<2>/g specific surface area measured by the BET method and >=70ml/100g oil absorption. The above-mentioned carrier is capable of supporting the agricultural chemical in an amount of 3-10 times that of the conventional carrier, and the supported agricultural chemical active constituent can be not only supported stably for a long period but also released slowly to exhibit germicidal, insecticidal and herbicidal activity, etc. for a long period and reduce remarkably the frequency of required agricultural chemical application. Thus, labor and other expenses can be greatly saved.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a carrier for agricultural chemicals, and more specifically, to a carrier for agricultural chemicals that has excellent pesticide retention properties.

[Prior Art] In general, pesticides are commercially available in liquid form such as emulsions and solutions, which are diluted with water before use, and those that are sprayed as solids such as powders, granules, and granules. However, solid pesticides are often used because of their advantages in manufacturing, packaging, storage, and use. This solid agrochemical mainly consists of an agrochemical active ingredient and an agrochemical carrier, and a stabilizer,
Auxiliary components such as sticking agents and disintegrants are added as necessary.

These solid agrochemical preparations have desirable properties when used for spraying to control pests and weeds, such as dispersibility, flowability, scattering properties, adhesion, oil absorption, swelling properties, and disintegration properties. It is required that there is no loss of these substances, no volatilization of pharmacologically active ingredients, and no deterioration during transportation and storage. In order to meet these demands, powders such as kaolin, montmorionite, talc, and silica sand have been used as carriers for agricultural chemicals, but nothing satisfactory has yet been obtained. Tokuko Showa 5th.

Publication No. 28881 discloses a carrier for agricultural chemicals which is mainly composed of granules obtained by powdering ceramics or refractories, and this carrier for agricultural chemicals has not only good physical properties but also the ability to contain the active ingredients of agricultural chemicals. It is said that it has good stability over time. However, since this am carrier consists of smooth particles with less over-pulverized fine powder and a surface covered with glass, it shows good results in improving the chemical stability of active agricultural ingredients. , the amount of active ingredients supported is small, and the ability to retain the active ingredients, that is, the ability to maintain the efficacy of the pesticide over a long period of time, is insufficient.

Furthermore, JP-A-57-156402 discloses mineral substances such as clay, bentonite, talc, zeolite, etc.
Disclosed is a mineral carrier for agricultural chemicals that can stably retain carbamate-based, phenoxy-based, and ester-based organic pesticide active ingredients against heat and the passage of time by firing at a temperature of 0 or higher. There is. However, this mineral carrier for pesticides also supports only a small amount of pesticide active ingredients.
Effective pest control and herbicidal effects cannot be maintained over a long period of time.

[Problems to be Solved by the Invention] The purpose of the present invention is to provide a carrier for agricultural chemicals that can stably support a large amount of active ingredients of agricultural chemicals and maintain the active action of the active ingredients over a long period of time. That's true.

[Constitution of the invention] The agricultural chemical i-form according to the present invention has a BE of 60 m2/g or more.
It is characterized by being composed of a calcium carbonate-silicate composite powder having a T specific surface area and an oil absorption amount of 7 Q ml/100 g or more. The calcium carbonate-silicic acid powder used in the present invention is prepared using colloid metal hydroxide, optionally with the addition of sulfuric acid or acetic acid, according to the method for producing easily dispersible calcium carbonate-based composite pigments described in Japanese Patent Application No. 58-38173. A sulfate or acetate of a metal capable of producing a substance is blown into a calcium hydroxide suspension together with carbon dioxide gas until the carbonation rate reaches 6%, and then carbon dioxide is added alone to reach a carbonation rate of 80%. It is produced by blowing the carbon dioxide gas up to 100%, then adding an alkali silicate or silicate sol, and then blowing carbon dioxide gas to complete carbonation. More specifically, water-soluble metal salts capable of producing colloidal metal hydroxides, such as aqueous solutions of sulfates and acetates of zinc, magnesium, aluminum, etc., or mixtures of these with sulfuric acid, acetic acid, etc. Carbonation rate (OaO
03 weight j110a (OH) 2 weight x'100 (%)) 6
For example, Nizhiev body is mixed into carbon dioxide gas in a spray state and the reaction is carried out so that the injection is completed within -300 mL.

Furthermore, when the carbonation rate reaches 80%, add soluble silicic acid, such as an alkali silicate, such as sodium silicate, or silicate sol, at a rate of 0.02 to 1 mole of calcium hydroxide in terms of 8102.
By adding ~0.08 mol and continuing the carbonation reaction, a calcium carbonate powder composite of silicic acid and zinc with extremely low cohesiveness is formed into chain particles with a diameter of 0.01 x a length of 0.05 to 1.00 μm. is obtained.

The calcium carbonate-silicate composite powder thus obtained is 0
．． 01 X O, 10 μm chain particles, 60
m2/g JJ, above BICT specific surface area and 7Qm
It has an oil absorption capacity of 1/100g or more. Since the agricultural chemical carrier according to the present invention has an extremely large oil absorption amount of 70 m1/100 g or more, it is possible to support agricultural chemical active ingredients in an amount 6 to 10 times that of conventional carriers. In addition, the agricultural chemical carrier of the present invention not only stably retains the supported agricultural chemical active ingredients over a long period of time, but also gradually releases the supported active ingredients and exerts bactericidal, insecticidal, herbicidal, etc. effects over a long period of time. This significantly reduces the number of pesticide applications required, resulting in significant savings in labor and other costs.

The present invention will be explained in more detail with reference to the following examples.

[Example] A powdered pesticide was produced with the following composition: Composition Part by weight Pesticide active ingredient Ax 60 Advantages of carrier according to the present invention 70 Gediethyl-2-isopropyl-4-methyl-6-pyrimidinyl phosphorothionate toge BICT Specific surface area' 98 m2/g % oil absorption 90
m1/100g The above ingredients were mixed in a ball mill and sieved to produce an agricultural chemical. The obtained powdered pesticide was sealed in a brown bottle, and 5
The residual amount of the active ingredient was examined after 1, 2.3 and 6 months after being placed in a thermostat at 0°0, and the results are as follows.

In addition, in the above example, the samples kept at 5 Q'a for 6 months showed almost no difference in dispersibility from those immediately after production.

[Effects of the Invention] From the above results, it can be seen that the active ingredients of the agricultural chemicals produced using the agricultural chemical carrier of the present invention are kept stable over a long period of time, and therefore the storage stability of the agricultural chemicals is dramatically improved.

Procedural amendment May 7th, 1982 1981 Patent Application No. 76ia 2. Name of the invention Pesticide carrier 3 Person making the amendment Relationship to the case, patent applicant Name Toyo Denka Kogyo Co., Ltd. and correct it.

Claims (1)

[Claims] BIT specific surface area of 6 Q m2/g or more and 7 Qm
An agricultural chemical carrier comprising a calcium carbonate-silica complex powder having an oil absorption of 1/100 g or more.