JPS61171401A - Porous calcined granulated carrier - Google Patents

Abstract

PURPOSE:A porous calcined granulated carrier having sufficient oil absorption amount, obtained by calcining a kneaded granulated carrier of an organic material such as grain flour, extracted cake, a mold of microorganism, sawdust, resin of acrylic acid, polyvinyl alcohol, etc. CONSTITUTION:A kneaded granulated carrier of any organic material of grain flour such as wheat bran, rice bran, starch, wheat flour, maize flour, etc., extracted cake such as soybean cake, colza oil, bagasse, beet cake, etc., a mold of microorganism such as baker's yeast, lactic acid bacteria, Chlorella, etc., a natural organic substance such as sawdust, cellulose powder, chitin, etc., and an organic substance such as a water-insoluble synthetic resin of acrylic acid, polyvinyl alcohol, etc., is calcined at 600-1,000 deg.C to give a porous calcined granulated carrier. The kneaded organic substance is evaporated by calcination, pores are formed on places wherefrom it is evaporated, and the amount of the organic substance is preferably about 2-25wt%. The carrier has about 30wt% absorption amount.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a porous fired granulated carrier.

<Prior Art> Pesticides are formulated into various dosage forms depending on the purpose of use, including emulsions, wettable powders, powders, and granules.

Among these, powders and granules are used in solid form. When powders are used as agricultural chemicals, for example, their single particles are as fine as 300 meshes (46μ) or less (most have an average particle size of 10 to 15μ), and their small mass makes them easy to drift in the wind. This method has the disadvantage that the chemical is scattered outside the sprayed area. If the drug contained is a poisonous or powerful drug, there is a great danger of the drug scattering.

On the other hand, although granules have high fluidity, they have extremely low scattering properties compared to powders, are easier to handle during transportation and use, and can be used relatively safely for poisonous and powerful drugs.

There are two methods for producing granules: a method in which a carrier is added to the main ingredient by a method such as rolling, and a method in which a granulated carrier that has been granulated in advance (so-called granulated carrier) is impregnated with the main ingredient as needed. In the former case, the base agent is mixed in at the same time as the carrier is manufactured.

Manufacturing control is difficult. For example, demand for pesticides is not constant, such as demand increasing from winter to spring, and there are times when it is necessary to manufacture large quantities in a short period of time. teeth,
Problems arise with the stability of the ingredients during storage. On the other hand, if a granulated carrier is used, the granulated carrier can be impregnated with the main ingredient as needed, so it is easy to control the manufacturing process, and products of stable quality can be supplied.

Conventionally, granulation carriers are made by mixing talc and bentonite with a binder, adding water, molding with an extruder, and then
Fluidized ventilation dried products have been used. However, these have high disintegration in water and are unsuitable as carriers for water-soluble agricultural chemicals, and water-soluble agricultural chemicals are used in the form of wettable powders, powders, or granules prepared by rolling. Therefore, the applicant of the present invention first discovered that it is possible to produce a fired granulated carrier that does not disintegrate in water by firing a conventional granulated carrier, and filed an application for this method (Japanese Patent Application No. 59-230903).

However, although the oil absorption amount of the fired granulated carrier has increased compared to before firing, it is not fully satisfactory. When the viscosity of the drug to be impregnated is high, it is convenient to dilute it and impregnate it, and therefore it is desirable that the carrier has a large oil absorption amount.

Porous natural carriers exist, such as calcined diatomaceous earth, pumice, and volcanic ash, but because they are natural products, their properties and supply amounts are unstable.

<Problems to be Solved by the Invention> Conventional granulated carriers cannot be used as carriers for water-soluble agricultural chemicals, and calcined granulated carriers are also not sufficiently satisfactory in terms of oil absorption. Therefore, an object of the present invention is to provide a granulated carrier that is useful not only as a carrier for water-insoluble pesticides but also for water-soluble pesticides and has sufficient oil absorption.

<Means for Solving the Problems> The porous fired granulated carrier provided by the present invention is obtained by firing a granulated carrier into which an organic substance has been incorporated. The organic substance used in the present invention may be either a natural organic substance or a synthetic organic substance, but examples of natural organic substances include grain flour (bran, bran, starch, wheat flour, rice flour, corn flour, etc.), extracted meal (soybean meal, rapeseed meal, etc.). lees, bagasse, beet lees, etc.), microbial cells (yeast such as baker's yeast and brewer's yeast; bacteria such as lactic acid bacteria and Bacillus natto; filamentous fungi such as Aspergillus aspergillus; basidiomycetes such as shiitake mushrooms; algae such as chlorella and spirulina), etc. ), sawdust, cellulose powder, chitin, lignin, fish meal, plant leaf powder, etc. Examples of synthetic organic substances include water-insoluble synthetic resins such as acrylic acid, polyvinyl alcohol, etc.

Raw materials for the granulated carrier used in the present invention include clays such as kaolin, sericite, and waxite clay, talc, bentonite, gicrite, acid clay, white carbon, calcium carbonate, silica stone, silica sand, diatomaceous earth, and pumice. ,
Examples include zeolite, perlite, vermiculite, and the like. In addition, binders used for granulation include starch, dextrin, alginic acid, casein, gelatin, gum arabic, carboxymethyl cellulose acid, polyvinyl alcohol, polyacrylic acid amide, nonionic surfactants, cationic surfactants, and anionic surfactants. Surfactants, amphoteric surfactants, animal/vegetable oils, acetyl cellulose, etc. can be used.

The porous calcined granulated carrier of the present invention is prepared by mixing the above-mentioned organic substance, carrier raw materials, and optionally a binder, and then adding moisture to obtain a granular product in a usual manner. Obtained by firing at ℃.

<Function> The porous fired granulated carrier of the present invention has a porosity that corresponds to the amount of organic matter that is mixed in, and pores are formed after the organic matter that has been mixed in by firing is volatilized. As the rate increases, the amount of oil absorbed also increases. However, the hardness slightly decreases due to the increase in porosity, so organic material (■) is selected to satisfy both oil absorption and hardness, and this is approximately 2 to 25% by weight of the granulated carrier. . In the field of agrochemicals, the oil absorption of granular carriers is generally preferably 15% or more, and does not need to be 35% or more. While the oil absorption of a conventional granulated carrier is about 13%, the oil absorption of the porous fired granulated carrier of the present invention can be increased to about 30%.

Examples of manufacturing the porous fired granulated carrier of the present invention are shown below.

Comparative example> Talc 65 Ky and bentonite 35 K9 were each put in powder form into a 0.2 ff/13 volume mixing kneader and mixed, and then water was added to this to make 23% (volume) of granulation water. Added and kneaded.

Next, this kneaded amount was put into a granulator (manufactured by Sanko Chemical Industry Co., Ltd.) equipped with a screen having a pore size of 0.9 sm to obtain a somen-shaped molded product. The molded product was crushed into cylindrical granular pellets.

Next, the cylindrical pellets were fluidized and dried with hot air at 160° C., and passed through a shifter to collect only the sized pellets to obtain granular pellets, that is, granulated carriers.

Next, this granulated carrier was fired at 700° C. for 1 hour to obtain a fired granulated carrier.

<Example 1> Talc 65Kg, bentonite 35Kg and bran 10
A granulated carrier was obtained in the same manner as in the comparative example by adding water to 27% (by weight) as granulating water. next,
This granulated carrier was fired at 700°C for 1 hour to obtain a porous fired granulated carrier (SP-10).

<Example 2> A porous fired granulated carrier (SP-20) was obtained in the same manner as in Example 1 using 65 K'J of talc, 35 Ky of bentonite, and 20 Kg of wheat bran.

Table 1 shows the physical property test results of the porous fired granulated carrier, fired granulated carrier, pre-fired granulated carrier, and natural gallite obtained in this way.

As shown in Table 1, the moisture content in the granulated carrier decreased from 1.5% to 0.1% by firing.

Moisture content of 5% or less is considered standard for pesticides, but
In particular, the unstable base material is specified to have a content of 1% or less, and a product that fully satisfies this condition was obtained by firing.

As for the degree of disintegration in water, it disintegrated in 2.5 minutes before firing, but no disintegration was observed after firing.

The oil absorption was 13.04% before firing and 13.79% after firing, whereas in the porous fired granulated carrier it was 24°81% and 28%, respectively.
．． 0.6%, and this difference appears as a remarkable effect not only when impregnating a high concentration drug but also when impregnating a diluted solution.

The degree of disintegration in water and the amount of oil absorption were measured by the following method.

Kigami Tane 11111 Vetri dish (intrinsic 9 cm) kept on a 20°C water bath
) to a depth of about 5M, add about 0.5g of granulated carrier.
Scatter it on the water surface, lightly touch the tip of your finger with the granules,
Measure the time until the presence or absence of solids is no longer palpable.

1 person 1 unit Remove 100 g of granulated carrier from cloudiness in a 200ae beaker, add about 2 d of "white kerosene" and stir with a glass rod.

After repeating this operation until the fluidity of the crystal begins to decrease, increase the amount of addition I by about 1M1 and repeat the same procedure until the fluidity disappears, which is the end point.

Claims (4)

[Claims] (1) A porous fired granulated carrier made by firing a granulated carrier into which an organic substance has been incorporated. (2) The porous fired granulated carrier according to claim 1, wherein the organic substance is a natural organic substance. (3) The porous fired granulated carrier according to claim 1, wherein the organic substance is a synthetic organic substance. (4) The porous fired granulated carrier according to claim 1, which is fired at 600 to 1000°C.