JPS593441B2 - Slowly soluble insecticide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new and useful slowly soluble insecticide.

In recent years, with the rapid development of the resin industry, a huge amount of its production has been consumed, and a huge amount of waste has been generated, causing pollution.

In order to eliminate the causes of such pollution, research is being conducted to modify these plastic materials into materials that do not generate waste pollution, such as improving stability against heat and light, which is the original requirement for resin materials. On the contrary, the challenge is to develop resin materials that can be easily decomposed by heat, light, etc., but no satisfactory technology has been provided yet.

On the other hand, these plastic wastes can be ■ incinerated, ■ recycled, and ■
Methods such as microbial decomposition are known, but method (2) not only causes secondary pollution due to the generation of toxic gases, but also has problems such as a short service life of the incinerator due to the large amount of combustion heat. Yes, and in ■, attempts are being made to use these wastes for land development and road paving.

In (2), a method for decomposing these wastes through the action of microorganisms has been researched and announced.

However, the diagonal method is complicated,
This is not satisfactory from the viewpoint of treatment costs or prevention of secondary pollution.

However, if a resin composition that is practical and does not cause waste pollution could be provided, it would be extremely useful in terms of waste treatment, but such resin compositions are hardly known. It has not been done.

The present inventors focused on this situation and conducted various studies, and as a result, the present inventors discovered a slowly soluble composition comprising a fired product (1) of an inorganic oxide and an alkali metal salt and a polymer or copolymer (2) of an unsaturated carboxylic acid. I ended up developing something.

In other words, this composition has practical shape retention and moldability, and also has the unique property of gradually dissolving in water, and as it gradually dissolves and disappears in rainwater, etc., it does not cause waste pollution. There is no.

The present inventors have completed further research to effectively utilize the characteristics of such slowly soluble compositions in combination with various insecticides. The gist lies in the fact that the insecticide (2) is blended and the insecticide (2) is gradually released.

The baked product (1) constituting the slowly soluble insecticide according to the present invention is obtained by baking an inorganic oxide and an alkali metal salt.

As the inorganic oxide, oxides of various elements ranging from Group 1 to Group II of the periodic table can be used, such as copper group elements such as copper, beryllium, magnesium, calcium, strontium, and barium. alkaline earth metal elements such as lead, zinc group elements such as lead, aluminum group elements such as boron and aluminum, carbon elements such as silicon, tin, and lead, titanium group elements such as titanium and zirconium, nitrogen group elements such as antimony. , vanadium group elements such as vanadium, chromium group elements such as chromium and molybdenum, manganese group elements such as manganese, iron group elements such as iron, cobalt, and nickel, and metal or nonmetal oxides.

Alkali metal salts include halides, hydroxides, carbonates, bicarbonates, etc. of lithium, sodium, potassium, etc.
Examples include inorganic salts such as nitrates, and organic salts such as formates and acetates, and these may be used alone or as a mixture of two or more.

The alkali metal salt is closely related to slow solubility, and by increasing or decreasing its content, the degree of slow solubility can be selectively adjusted over a wide range.

Therefore, the proportion of the alkali metal to be used can vary over a wide range depending on the degree of slow solubility of the composition and should not be particularly limited; however, it is usually desired to obtain a composition with high solubility. In this case, the amount is arbitrarily selected from the range of 50 to 200 parts by weight per 100 parts by weight of the unsaturated carboxylic acid polymer, and in the case of obtaining a composition with low solubility, the amount is arbitrarily selected from the range of 1 to 50 parts by weight.

Incidentally, the conditions for firing the oxide and the alkali metal salt may be as high as 500°C or higher (particularly preferably in the range of 900 to 1300°C; within that temperature range, It is best to bake for about 10 hours.

In addition, in the above-mentioned calcination, the solubility of the slowly soluble composition (obtained by mixing it with an unsaturated carboxylic acid polymer) tends to increase as the calcination temperature is lowered or the calcination time is shortened. Therefore, the firing temperature and firing time are appropriately selected and determined depending on the desired degree of slow solubility.

In addition, the fired product (2) is usually used after being ground into fine particles of 300 mesh or less in order to easily and completely knead it with the unsaturated carboxylic acid polymer.

Polymers or copolymers of unsaturated carboxylic acids (2) are obtained by homopolymerizing or copolymerizing unsaturated carboxylic acids such as acrylic acid, methacrylic acid, fumaric acid, maleic acid, crotonic acid, vinyl acetic acid, and cinnamic acid by conventionally known methods. It is a viscous liquid obtained by copolymerization.

The polymerization method is not particularly limited, but examples of commonly employed methods are as follows.

(2) A photosensitizer such as benzophenone or acetone is added to unsaturated carboxylic acids alone or as a mixture, and the mixture is polymerized by irradiation with ultraviolet rays using a high-pressure mercury lamp or the like in an aqueous solution.

■ Unsaturated carboxylic acids alone or in mixture, 0.5
adding ~5.0% by weight of a free radical catalyst, such as ammonium persulfate, potassium persulfate, sodium persulfate, etc.;
Aqueous solution polymerization is carried out at a temperature of 80 to 100°C under a nitrogen atmosphere.

At this time, an appropriate amount of a degree of polymerization regulator, such as isopropyl alcohol, may be added as necessary.

The thus obtained baked product (1) and polymer (2) are kneaded in a ratio of, for example, 1 part of the former to 0.11 to 5 parts of the latter, and then left to stand, solidifying in 4 to 30 minutes to obtain a hard resin.

Therefore, by kneading these in a predetermined ratio and press-fitting and fixing them into a desired mold, a molded product of any shape can be obtained.

However, when the molded product comes into contact with water, it gradually dissolves from its surface and has so-called slow solubility, but the degree of slow solubility can be determined by increasing or decreasing the amount of the alkali metal salt used in the baked product. It can be adjusted arbitrarily by

The slowly soluble insecticide of the present invention can be obtained by incorporating agricultural or public health insecticide (2) into the slowly soluble composition.

That is, if the slowly soluble composition contains the insecticide (2),
As the slowly soluble composition gradually dissolves in water, the insecticide ■ gradually dissolves, so by arbitrarily adjusting the degree of slow solubility of the slowly soluble composition, the sustained release of the insecticide ■ can be freely controlled. It can be adjusted.

A very wide range of insecticides can be used as such insecticides, and typical examples include various agricultural insecticides and various insecticides for public health, but there are also preservatives and fungicides. , fungicides, etc. are also included within the scope of the insecticides referred to in the present invention.

The method of incorporating these insecticides (1) into the slowly soluble composition is not particularly limited. Any of the methods of adding the insecticide (2) at the time of kneading (2) and kneading at the same time can be adopted.

As described above, the insecticide of the present invention has the unique property of slow solubility, so it has an extremely long-lasting insecticidal effect, has little dispersion loss when applied underground, and can be applied in large quantities at once. Since there is no fear of the insecticide spreading, it is possible to enjoy many benefits such as significantly reducing chemical damage.

Next, the present invention will be explained by reference examples and examples.

Reference Example 1 [Example of producing baked products] Baking salt 1) Lead oxide 50 parts by weight Magnesium oxide 40 parts by weight Sodium fluoride 10 parts by weight The above mixture was fired at 1000°C for 3 hours and then jet-pulverized to 300 mesh or less. powder of particles.

Calcined product (2) Lead oxide 50 parts by weight Magnesium oxide 30 parts Potassium fluoride 10 parts by weight The above mixture was fired at 1000° C. for 2 hours and then jet-pulverized to form a powder with particles of 300 mesh or less.

3) Lead oxidation capacity 40 parts by weight Magnesium oxide 20 parts by weight Rusium oxidation capacity 20 parts by weight Potassium fluoride 20 parts by weight Calcination vA4) Lead oxide 40 parts by weight Silicon oxide 30 parts by weight Magnesium oxide 20 parts by weight Sodium fluoride 20 parts by weight Calcined salt 5) Oxidizing capacity Lead 20 parts by weight Magnesium oxide 60 parts by weight Potassium fluoride 10 parts by weight Calcined product (6) Magnesium oxide 80 parts by weight Sodium carbonate 40 parts by weight Saliva oxide 10 parts by weight The above powder (3X4X5X6) The blended mixtures are all 1
It was fired at 200° C. for 5 hours and jet-pulverized to 300 meshes or less.

[Polymer production example]

Polymerizer 1) Maleic acid 60 parts by weight Acrylic acid 10 parts by weight Benzophenone 5 parts by weight Distilled water 100 parts by weight Polymer (2) Acrylic acid 80 parts by weight Crotonic acid 10 parts by weight Acetone 5 parts by weight Distilled water 100 parts by weight Polymer ( 3) Fumaric acid 40 parts by weight Methacrylic acid 10 parts by weight Vinyl acetic acid 10 parts by weight Acetone 5 parts by weight Distilled water 100 parts by weight After irradiating the blend of (1) (2X3) above with ultraviolet rays from a W high pressure mercury lamp. , unreacted substances and the solvent were distilled off, and the mixture was concentrated until the concentration of the polymer and copolymer was 40%.

The viscosity is 11000CPS, 14000CPS, respectively.
It was 1ooooocps.

Polymer (4) Acrylic acid 50 polymer parts 4 /
yoo e”iv 7 iv 10 parts by weight Sodium cole persulfate 1 part by weight Distilled water 150 parts Among the above formulations, Inglobil alcohol and sodium persulfate were mixed with distilled water, put into a reactor, and heated to 85°C ± 3°C.
Acrylic acid was added dropwise over a period of 3 hours while stirring to polymerize.

After the reaction is complete, water is removed under reduced pressure to reduce the concentration of the polymer to 35%.
I made it.

Average molecular weight 50000, viscosity 12000 CP S0
Polymer c) Maleic acid 20 parts by weight cinnamic acid
5 parts by weight Methacrylic acid 10 parts by weight Ammonium persulfate 2 parts by weight Distilled water 100 parts by weight The above formulation was also copolymerized in the same manner as in (4).

Concentration 40%, average molecular weight 20,000. Viscosity: 10,000 CPS0 Polymer 6) Acrylic acid: 40 parts by weight Methacrylic acid: 10 parts by weight Ammonium persulfate: 1 part by weight Distilled water: 150 parts by weight The above blend was also copolymerized in the same manner as in (4).

Concentration 43%, average molecular weight 25000. Viscosity 11,000 CPS0 Each of the above-mentioned fired products and the polymer or copolymer were kneaded in a ratio of 2:1 (parts by weight) to obtain a cylindrical molded product with a diameter of 6 mm and a height of 12 mm.

After 25 minutes, a hard resin molding with a smooth surface was obtained.

The following table shows the measured physical properties of each molded product.

The anti-compressive force was measured using a compression tester using a cylindrical test piece with a diameter of 6 mm and a height of 12 mm.

The dissolution rate was determined by immersing the above test piece in distilled water at 20°C.
It is shown as % weight loss after 1 week.

Example 1 1 part by weight of an organophosphate insecticide (IPSP agent) containing S-(ethylsulfinylmethyl)-diisopropyl phosphorothiorothionate as an active ingredient was added to the baked product (1) 1
After uniformly kneading the mixture with 0 parts by weight and 4 parts by weight of polymer 3), the mixture was granulated to obtain a granular insecticide.

When planting onions, the active ingredient of the insecticide is added to the roots of onions by 10 to 15'? When applied in such a way as to produce a total of 100% of plants, no outbreaks of mites, onion flies, etc. were observed from the growing season to harvest.

On the other hand, when using IPSP granules as is, they are applied in two or three times during the growing period, but if 151/plant is applied at once at the time of planting, the above-mentioned pests will occur at the end of the growing season. There has occurred.

That is, according to the present invention, it is not necessary to apply the insecticide in parts (the insecticidal effect can be maintained for a long period of time with one application).

Furthermore, since the slowly soluble insecticide of the present invention also has a diluting effect, it significantly alleviates chemical damage during application, and since it is sustained release, there is little loss due to dispersion of the insecticide underground.

Claims (1)

[Claims] 1. A slow-soluble insecticide characterized by consisting of a baked product (1) of an inorganic oxide and an alkali metal salt, (2) a polymer or copolymer of an unsaturated carboxylic acid, and (2) an insecticide.