JPH03223205A - Boric acid solution and insecticide - Google Patents

Abstract

PURPOSE:To provide a safe and easily applicable insecticide, especially an insecticide for protecting wood from termite, comprising a homogeneous boric acid solution containing an ammonia derivative and a polyhydric alcohol and containing boric acid in high concentration. CONSTITUTION:A boric acid solution having high concentration is produced by adding an ammonia derivative and a polyhydric alcohol to boric acid, thereby increasing the solubility of boric acid. The boric acid solution having high concentration is used as an insecticide, especially insecticide for termite. Preferably, 0.2-5 pts.wt. of ammonia derivative and 0.2-5 pts.wt. of polyhydric alcohol are used based on 1 pt.wt. of boric acid. It is especially preferable to use 0.2-5 pts.wt. of a polyhydric alcohol having amino group in the molecule based on 1 pt.wt. of boric acid. Since the solution is stable, it can be stored in the form of a solution having high concentration and used after proper dilution. It exhibits mildewcidal effect as well as insecticidal effect.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a boric acid solution and an insecticide comprising the boric acid solution, particularly an insecticide for protecting wood from termites.

(Prior art) Boric acid is a compound that has a moderate insecticidal effect, so
It is used to prevent termites and other harmful insects by spraying it on wood, etc. in the form of a solution, or applying it with a brush.

However, as shown in Table 1, boric acid is difficult to dissolve in common solvents and cannot provide a uniform solution strength at high concentrations, so even if applied to wood, sufficient effectiveness may not be obtained. (G I in Table 1) Serine has a relatively high solubility, but a boric acid glycerin solution does not remain sticky for a long time even when applied to wood etc. because glycerin is hygroscopic. Table 1 (Problems to be solved by the invention) The purpose of the present invention is to obtain a homogeneous solution containing boric acid at a high concentration, and to provide an insecticide that is safe and easy to use. That's true.

(Means for Solving the Problems) The present invention provides boric acid containing an ammonia derivative and a polyhydric alcohol. The present invention provides an insecticide consisting of a liquid solution.

In the present invention, boric acid is easily dissolved by containing an ammonia derivative and a polyhydric alcohol, and a boric acid solution with a high concentration hitherto unknown can be obtained.

The boric acid solution of the present invention contains 0.2 to 5 parts by weight of an ammonia derivative and 0 parts by weight of polyhydric alcohol per 1 part by weight of boric acid.
．． It is preferable to include 2 to 5 parts by weight. When containing 0.5 to 1.5 parts by weight of an ammonia derivative and 0.5 to 1.5 parts by weight of polyhydric alcohol per 1 part by weight of boric acid,
More preferred.

As the ammonia derivative, any of ammonia, primary amines, secondary amines, tertiary amines, and quaternary ammonium salts can be used. If a highly volatile material such as ammonia is used, the odor will be strong and the work will be difficult, so it is better to use a material with appropriate volatility. Among the ammonia derivatives, tertiary amines are preferred. Specifically, alkyl tertiary amines are preferred;
Particularly preferred is triethylamine.

The polyhydric alcohol used in the present invention is not particularly limited, and various types can be used. For example, dihydric alcohols such as ethylene glycol, propylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, diethylene glycol, polyethylene glycol, trihydric alcohols such as glycerin, tetrahydric alcohols such as erythritol, fructose,
Examples include sugars such as mannose and galactose.

Among these, particularly preferred are ethylene glycol, diethylene glycol and polyethylene glycol.

In the present invention, since the three components of boric acid, polyhydric alcohol, and ammonia derivative react to form a complex, a stable one
It is thought that liquid is formed. Water is required for the formation of this three-way complex. Since water is produced when boric acid and polyhydric alcohol react, it is not necessarily necessary to add water from the beginning.

In the present invention, when a polyhydric alcohol having an amino group in the molecule is used as the ammonia derivative, since the ammonia derivative itself is a polyhydric alcohol, it can be used at high concentrations without adding another polyhydric alcohol. A stable boric acid solution is obtained. As the polyhydric alcohol having an amino group in the molecule, tris(hydroxyalkyl)amine is preferred, and triethanolamine is particularly preferred.

A polyhydric alcohol having an amino group in its molecule is boric acid 1
It is preferable to use 0.2 to 5 parts by weight based on the weight part. More preferably, the amount is 0.5 to 1.5 parts by weight per 1 part by weight of boric acid.

Even when a polyhydric alcohol having an amino group in the molecule is used, a polyhydric alcohol without an amine group in the molecule is used.
It is preferable to add 2 to 5 parts by weight because a more stable @ liquid can be obtained. 0.5 to 1 part by weight of boric acid.
More preferably, the amount is 5 parts by weight.

The solution of the present invention can be suitably produced, for example, by the following method, but is not necessarily limited thereto.

First, mix water and polyhydric alcohol, and add 50
Heat to ~200°C and gradually add the specified amount of boric acid while stirring. At this time, boric acid does not need to be completely dissolved. Then, when an ammonia derivative is added while continuing heating and stirring, the above-described complex formation reaction occurs and a homogeneous solution is obtained.

When using a polyhydric alcohol having an amino group in its molecule, a homogeneous solution can be obtained by mixing it with a predetermined amount of boric acid and slowly heating the mixture. If these solutions are appropriately diluted by adding water or alcohol, a boric acid solution of any concentration can be obtained.

Such a boric acid solution can be suitably used as an insecticide.

The insecticide of the present invention may also contain a resin component suitable as a paint in order to be applied to wood.

The insecticide of the present invention can be applied to wood to prevent it from being damaged by termites, bark beetles, and the like. It also has the effect of preventing the growth of mold on wood.

(Example) Example 1 Polyethylene glycol (molecular weight: approximately 600) Log
and 10 g of water were mixed, and while heating to 100°C, 20 g of boric acid was added and stirred. Add 25g of triethylamine while some of the boric acid remains, and then heat to 100°C.
When heating was continued for 5 minutes, a colorless, transparent and homogeneous solution (boric acid 1°C, 30.7% by weight) was obtained, so heating was stopped and the solution was allowed to cool.

No cloudiness or precipitate was observed in this solution even after long-term storage. Moreover, this solution could be diluted to any concentration with water or alcohol.

Example 2 A colorless and transparent boric acid solution (boric acid concentration: 28.5% by weight) was obtained in the same manner as in Example 1 using 20 g of ethylene glycol, log water, 20 g of triethylamine, and 20 g of boric acid.

Example 3 A colorless and transparent boric acid solution (boric acid concentration 37.5% by weight) was prepared in the same manner as in Example 1 using 20 g of ethylene glycol, 10 g of water, 20 g of triethylamine, and 30 g of boric acid.
I got it.

Example 4 Polyethylene glycol (molecular weight: about 600) Log
and 10 g of water were mixed, and while heating to 100°C, 20 g of boric acid was added and stirred. Add 25g of triethanolamine while some of the boric acid remains, and add 1
Heating was continued at 00°C, and a colorless, transparent, homogeneous solution was obtained after 5 minutes, so heating was stopped and allowed to cool.

The boric acid concentration of this solution was 30.7% by weight.

Example 5 A colorless and transparent boric acid solution (boric acid concentration: 28.5% by weight) was obtained in the same manner as in Example 1 using 20 g of ethylene glycol, 10 g of water, 20 g of triethanolamine, and 20 g of boric acid.

Example 6 A colorless and transparent boric acid solution (boric acid concentration: 37.5% by weight) was obtained in the same manner as in Example 1 using 20 g of ethylene glycol, 10 g of water, 20 g of triethanolamine, and 30 g of boric acid.

Example 7 Fructose 15g, water 10g, triethanolamine 20g,
A colorless and transparent boric acid solution (boric acid concentration 35.7% by weight) was obtained in the same manner as in Example 1 using 25 g of boric acid.

Example 8 A colorless and transparent boric acid solution (boric acid concentration 35.7% by weight) was prepared in the same manner as in Example 1 using 15 g of galactose, log water, 20 g of triethanolamine, and 25 g of boric acid.
I got it.

Like the solution of Example 1, the solutions obtained in Examples 2 to 8 were all stable, and no cloudiness or precipitate was observed even after long-term storage. Moreover, this solution could be diluted to any concentration with water or alcohol.

Example 9 Add 40 g of triethanolamine to 40 g of boric acid to give approx.
Heating to 20°C and stirring for 10 minutes gave a clear boric acid solution. This solution was gradually cooled to 100°C.
When the temperature reached 20 g, room temperature water was added. The 40% by weight boric acid solution thus obtained was stable for a long period of time and could be diluted with water or alcohol to any desired concentration. Even when the diluted solution was left at room temperature for a long period of time, no precipitation occurred.

Example 10 Add 30 g of triethanolamine to 70 g of boric acid to give approx.
The mixture was heated to 20° C. and stirred for 20 minutes to obtain a clear and viscous boric acid solution. The solution was gradually cooled and
When the temperature reached 0° C., 250 g of room temperature ethanol was added. This boric acid solution is stable for a long period of time and does not cause precipitation even if left at room temperature for a long period of time.

A similarly stable solution was obtained by using methanol or a mixed solution of ethanol and methanol for 7 days instead of ethanol. All of these /8 solutions could be diluted with water or alcohol to any desired concentration. This diluted solution did not cause precipitation even when left at room temperature for a long period of time.

Example 11 40 g of triethanolamine was added to 100 g of boric acid, heated to about 120° C., and stirred for 20 minutes to obtain a transparent and viscous boric acid solution. This solution was gradually cooled and
When the temperature reached 00°C, 355 g of a 1=1a combined solution of methanol and ethanol at room temperature was added.

To this solution were added 25 g of melamine-formaldehyde resin (manufactured by Mitsui Toatsu Chemical Co., Ltd.; Cymel 325■) and 0 of a polymerization initiator (manufactured by Mitsui Toatsu Chemical Co., Ltd.: Catalyst-6000).
Added 25g. A clear solution was obtained, and this @ solution was also stable even after long-term storage.

Example 12 40 g of triethanolamine was added to 100 g of boric acid, heated to about 120°C, and stirred for 20 minutes to obtain a transparent and viscous boric acid solution. This solution is gradually cooled and
When the temperature reached 100° C., 355 g of a 1:1 mixed solution of methanol and ethanol at room temperature was added overnight.

Add 25% polyethylene glycol methacrylate to this solution.
g was added to obtain a homogeneous solution. This solution was also stable even after long-term storage.

Example 13 Red pine (scientific name pimus densiflora)
The solution of Example 11 was applied to the surface of the material at a coating amount of 200 g/m 2 and dried at 60° C. for 10 hours. Coptotermies formosamus (scientific name: Coptotermies formosamus)
) were buried around the red pine stumps where they were nesting. Five treated red pine trees and five untreated red pine trees for comparison were alternately buried at equal intervals.

One year later, these specimens were pulled out and observed. Of the treated test specimens, only one had been partially damaged by termites, but the other four had not suffered any damage.All of the untreated specimens had suffered damage from termites. was.

Example 14 For /g't& of Examples 1, 5, and 12, the same termite damage test as in Example 13 was conducted. In both cases, similar to the solution of Example 11, there was almost no feeding damage.

Example 15 Add 30 g of triethanolamine to 70 g of boric acid to give approx.
The mixture was heated to 20° C. and stirred for 20 minutes to obtain a transparent and viscous boric acid solution. The solution was gradually cooled and
When the temperature reached 0℃, add 250g of room temperature ethanol,
A boric acid solution was obtained.

This solution was further diluted twice with ethanol to obtain a solution with a boric acid concentration of 10% by weight. Lauan material test piece (10mm
x 50n+m8100mm) 50mm x 100
This solution was applied at a coating amount of 130 g/m'' to one side of the 2 mm surface, and the sample was left at room temperature for 14 days and in a thermostat at 40° C. for 30 days.

Drill 32 holes with a diameter of 2 mm in a 10 mm x 50 mm x 100 mm aluminum plate, place one bark beetle (scientific name: Lyctus brunneus 5teph) larva (weight 2-3 mg) in each hole, and apply the lauan material on both sides. It was identified with a rubber band by holding it so that it was in contact with the aluminum. Fill each hole with flour,
Filled with a mixture of yeast powder and cellulose powder. This test piece was maintained at 25°C1 relative humidity of 70-75%. For specimens treated with boric acid solution and specimens without treatment,
Observed for 3 months. The number of feeding holes was measured, and the number of adults that emerged and escaped. Those treated with boric acid solution are
The number of feeding holes was 10, and the number of escapees was 0. Those that were not treated had 29 feeding damage holes and 20 emergence escapes.

Example 16 Example 4.5.11 /8/? ! For each of these, the same feeding damage test for Japanese termites as in Example 15 was conducted.

The results are shown in Table 2.

Table (Effects of the Invention) The boric acid solution of the present invention can contain boric acid at a high concentration. This solution is stable and can be diluted to any concentration, so it can be stored as a highly concentrated solution and used after being diluted as appropriate.

When using the solution of the invention as an insecticide, it is safe and
Has moderate insecticidal effect. By applying this solution to wood, etc., a high insect repellent effect can be obtained, and it is particularly suitable for protecting wood from damage by termites and bark beetles.

Claims (4)

[Claims] (1) An insecticide consisting of a boric acid solution containing an ammonia derivative and a polyhydric alcohol. (2) 0.0% ammonia derivative per 1 part by weight of boric acid.
A boric acid solution containing 2 to 5 parts by weight and 0.2 to 5 parts by weight of a polyhydric alcohol. (3) A boric acid solution containing 0.2 to 5 parts by weight of a polyhydric alcohol having an amino group in the molecule per 1 part by weight of boric acid. (4) An insecticide comprising the boric acid solution according to claim 1 or claim 2.