JPH0436206A - Termite controlling agent - Google Patents

Abstract

PURPOSE:To obtain a controlling agent, improved in luring properties and excellent in safety, anti-termite effects and preventing effects on desolvation by containing a sparingly soluble salt of molybdenum and/or tungsten acid in a base material composed of mechanical pulp. CONSTITUTION:A termite controlling agent is produced by impregnating a base material composed of mechanical pulp with a water-soluble salt of molybdic acid and/or a water-soluble salt of tungstic acid at preferably (85-35):(15-65) ratio expressed in terms of Mo or W so as to provide 0.5-20% content of the total amount thereof based on the base material by a method for injection, spraying, dipping, etc. Furthermore, a drying step is preferably applied and an aqueous solution of an inorganic acid or an inorganic salt in an equiv. amount of 0.5-1.0 based on an impregnated molybdate and/or tungstate is added by a method for dipping, etc., to produce and deposit a sparingly soluble Mo and/or W compound by salt exchange in the base material.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a termite control agent characterized in that a base material made of mechanical pulp contains a sparingly soluble salt of one or both of molybdenum and tungsten. .

[Conventional technology]

In recent years, damage caused by pests that feed on wood, such as termites, carp beetles, and wood beetles, has become a problem.

In order to prevent damage from these pests, insect repellent treatment suitable for roughening materials has traditionally been carried out, and for this purpose,
Organic chlorine insecticides such as chlordane and dieldrin are used as insecticidal and insect repellent ingredients.

However, all of these insect repellent ingredients have problems in terms of persistence, toxicity, irritation, and environmental pollution, and there is a desire to develop low-toxicity insect repellents.

By the way, according to the disclosure of Japanese Patent Laid-Open No. 59-82309, it is proposed that an effectively soluble compound of an element selected from the group consisting of molybdenum and tungsten suppresses animals fixing nitrogen. This discovery is as follows: 1. Molybdenum and tungsten are cheap.

It is safer than 2chromium and other metals.

&Molybdenum and tungsten are highly selective, showing no toxicity to pests other than nitrogen-fixing animals such as termites and carp beetles.

4. It is slow-acting, so it is not repelled by termites etc.

5. Stable in various forms.

In these respects, it is extremely useful as an insect repellent for wood.

By the way, in the case of termite insecticides obtained by the conventional manufacturing method of termite insecticides, that is, the method of impregnating water-soluble salts of molybdic acid and tungstic acid into cellulose base materials such as wood and then drying them, molybdenum and tungsten are Because they are not sufficiently fixed in the cellulose base material, when actually used outdoors, molybdenum and tungsten may be leached due to rain, etc., resulting in a decrease in efficacy. Therefore, the present inventors conducted formulation research and found that the amount of molybdenum and tungsten in the water-soluble salt impregnated into the cellulose base material was 5% each.
We discovered that a method of converting 0 to 100% of the amount into molybdenum and tungsten compounds, which are poorly soluble in water, by salt exchange was extremely useful, and applied for a patent.
Patent application 1986-157705).

However, the conventional method of producing and fixing poorly soluble salts of molybdenum and tungsten on cellulose substrates such as wood has poor feeding ability for termites, and the problem remains that it is not sufficiently effective in practical use. Ta.

[Problem that the invention seeks to solve]

The present invention provides a termite control agent containing molybdenum and tungsten that maintains termiticidal efficacy and sustainability, while also improving feeding ability and increasing the amount eaten by termites to more accurately express its effectiveness. It is intended for that purpose.

[Means and effects for solving the problem] In order to achieve the above-mentioned object, the present inventors have achieved a feedability comparable to that of untreated wood chips by using mechanical pulp as a cellulose base material. The present invention was completed based on the discovery that the following is true. Although there are many unknowns as to why mechanical pulp pieces become more palatable than wood chips or wood chips when treated with chemicals, it is possible that inorganic substances are removed during the mechanical pulp papermaking process, and the component composition is modified based on this. Quality may be a factor. Additionally, paper is generally more attractive to termites than wood.
It is presumed that the mechanical pulp's fibers are arranged like layers of paper, making it softer than wood, which also contributes to its good feeding ability.

In producing the termite control agent of the present invention, one or both of a water-soluble salt of molybdic acid and a water-soluble salt of tungstic acid are added to a base material made of mechanical pulp, preferably,
Molybdenum, 85-35 as tungsten: 15-6
With a composition ratio of 5, the total amount is 0.5 to 20% relative to the base material.
% by injection (injection, reduced pressure), spraying, dipping, or other methods.

Further, preferably, after the drying step, one or both of the impregnated molybdenum salt and the tungstate is 0.0.
An aqueous solution of an inorganic acid or inorganic salt at an appropriate concentration of 5 times equivalent or more, preferably 0.5 to 1.0 times equivalent, is added into the base material by a method such as injection (pressure injection, reduced pressure), spraying, or dipping. One or both of poorly soluble molybdenum and tungsten compounds are produced and deposited by salt exchange. After drying the treated substrate, if necessary, it can be molded into a desired dosage form to obtain the anti-anticide of the present invention.

Water-soluble molybdates and tungstates used in the present invention include, for example, sodium molybdate (NaJoO; 39.4 (28°C)) ammonium molybdate ((NHt)sMo+oza; 43 (25°C)).
), Potassium molybdate [K2MoO,: 64.6 (25°C)] Magnenium molybdate (MgMoOa; 15.9 (25°C)) Sodium tungstate (Na, WO,: 57.6 (0°C)) Examples include ammonium tungstate (5(NH,)20.+2WO,) potassium tungstate (K, WO,), but are not limited to these.

The number after the chemical formula is the water solubility (g/
100n/).

Inorganic acids and inorganic salts that dissolve the water-soluble salts mentioned above include inorganic acids, such as nitric acid, hydrochloric acid, and sulfuric acid, and inorganic salts.
...Salts of alkaline earth metals (calcium chloride, barium chloride, barium nitrate, etc.), salts of aluminum group metals (aluminum nitrate, etc.), salts of copper group metals (silver nitrate, etc.), salts of iron group metals (silver nitrate, etc.) iron, ferric chloride, cobalt chloride, etc.), and as a result, molybdic anhydride (Mo5s; 0.049 (28°C)) molybdic acid (H2MOO4; 0.133 (18°C)) calcium molybdate (CaMo0a ・0.005' (25°C)) Iron molybdate (FeMo0+; 0.0076 (25°C)) Barium molybdate (BaMoO4: 0.0058 (25°C)), silver molybdate, aluminum molybdate, etc. Molybdate and tungstic anhydride (WOI) Tungstic acid (H,WO,) Calcium tungstate (CaWO,: 0.0032 (25°C)) Iron tungstate (FeWO,) Barium tungstate (BaWO,: 0 .001 (25°C)], silver tungstate, aluminum tungstate, and other useful sparingly soluble compounds.

The number after the chemical formula is the water solubility (g/
100J).

Additionally, a termite attractant may be added in order to more efficiently exhibit insecticidal and insect repellent effects.

As a termite attractant, for example, rotten material of Physcomitrella chinensis and rotten material of Chirimentake can be mentioned, and it is also possible to prepare a formulation by adjusting rotten wood chips to an appropriate size, or to add a solvent extract from rotten wood chips to the base material. It is.

Furthermore, the termite control agent of the present invention includes organic phosphorus agents such as chlorpyrifos, phoxim, and pyridafenthione;
pyrethroids such as permethrin, fluparinate, fenvalerate, and fenbrobatrin, or other insecticides such as tripropylisocyanurate and carbamates, or synergists such as 5-421 and piperonyl butoxide. Additionally, various types of preservatives such as CCA, CCB, and halofenols such as bentachlorphenyllaurate, p-bromo-26-dichlorophenol, etc. Oiodopropargyl compound -IF l, 000, 3-iodo-2-propynylbutylcarbamate, 3-ethquine carbonyl oquino 1-bromo-
1,2-Short propene, etc. Quaternary ammonium compounds and amine salts - Benzalkonium chloride, dialkyldimethylammonium chloride, etc. Organotin compounds - Bis(n-tributyltin) quinodo, tributyltin terephthalate, etc. - Naphthenes Useful multi-purpose compositions can also be obtained by appropriately mixing zinc chloride, aluminum salt, etc. with the base material. Composition of mechanical pulp used in the present invention,
Specifications are not particularly limited, but for example, thermomechanical pulp can be used, and a board with a thickness of about 51 mm, a not very dense and soft material with a basis weight of about 800 to 1,500 g/m. Some are preferable because they are more palatable.

The dosage form of the termite control agent of the present invention includes properties of the termite control agent,
Depending on the purpose of use, various materials such as pellets, plywood, and construction materials can be used, but those molded into wood chips using a press or cutter are particularly suitable as bait materials for termite control, and surfactants may be added as appropriate. Alternatively, a fixing agent or adhesive such as casein, gelatin, starch powder, CMC, or polyvinyl alcohol is used. The common method for applying the present termite control agent is to bury the treated pieces in the soil under or around a house, but it is also useful to apply it to termite prevention plywood and construction materials, for example.

The effects of molybdenum and tungsten compounds on termites are slow-acting and non-repellent compared to general insecticides (therefore, the present termite control agent uses the blooming or cannibalism phenomenon of ingested termites. It can eradicate the entire nest.

〔Example〕

Next, the present invention will be explained in more detail with reference to test examples and examples, but it goes without saying that the present invention is not limited to these.

Test Example 1 A base material made of thermomechanical pulp of 2 X 2
Furthermore, a barium chloride aqueous solution was impregnated in an amount equivalent to one molybdenum to generate a hardly soluble barium molybdate salt in Motomura.

On the other hand, as a control, 2
Wood pellets shaped and solidified into 2 x 1.2 cm were provided.

For comparison, tests were also conducted on specimens of both base materials at the sodium salt stage without undergoing treatment to make them insoluble.

The antitermite efficacy test was conducted using the following two methods.

(]) Test of treated specimens alone: Each treated specimen and 50 termites were released into Noyale, and the amount eaten and the lethal dose were examined after 1, 2, 3, and 4 weeks.

(2) Juxtaposition test of treated specimens and untreated wood chips: Each treated specimen and red pine wood chips were placed side by side on a noyare, and the test was conducted in the same manner as in (1).

The test results are shown in the table below.

As a result of the test, the Kinobori plain ant control agent using thermomechanical pulp as a base material and treated with molybdenum to make it insoluble had higher feeding amount and mortality rate than the control molded wood powder product, and moreover, Even in the test (2) conducted in parallel, there was only a slight decrease in efficacy, making it clear that the material is extremely useful as a treatment base for sparingly soluble salts. In the case of a water-soluble salt (sodium molybdate) used for reference, high efficacy was obtained regardless of the type of substrate, but leaching was extremely unsuitable for practical application.

Next, examples of the present invention will be shown, but the present invention is of course not limited to these.

Example 1 A substrate made of thermomechanical pulp, 6 x 13 an inch thick, is impregnated with an aqueous solution containing 5.0% sodium molybdate (as molybdenum) and 3.0% sodium tungstate (as tungsten) for about 80 minutes, After air drying for 2 days, an equivalent amount of barium chloride aqueous solution was impregnated to obtain a termite control bait. When this was placed under the house and in the surrounding soil at a rate of 5 pieces/day, it was possible to prevent termite damage to the house for over two years, and finally, the entire termite nest could be exterminated by cannibalism of the termites. Ta.

Example 2 According to Example 1, ammonium molybdate 4.2%,
After impregnating with an aqueous solution containing 1.8% ammonium tungstate and 4% benzalkonium chloride, the bait was treated with calcium chloride to obtain a termite control bait. A set of one tree and the above-mentioned bait agent IOke were placed in six locations around the nests of Japanese termites in the field, and the conditions of each tree and the nest were observed every month. It was confirmed that feeding damage had decreased dramatically and nest activity had slowed down.

〔Effect of the invention〕

The termite control agent of the present invention has higher safety and
The present invention provides an extremely useful pesticidal agent that has excellent termite-preventing and leaching-preventing effects, and has improved termite feeding by using mechanical pulp as a base material.

Claims (1)

[Scope of Claims] A termite control agent characterized by containing a sparingly soluble salt of one or both of molybdenum and tungsten in a base material made of mechanical pulp.