JPH0578217A - Anti-septic and ant-proof agent for wood - Google Patents

Abstract

PURPOSE:To provide an anti-septic and ant-proof agent for wood, containing a specified alkyldimethylamine pentaborate or its hydrate as the active component, capable of synthesizing at a relatively low temperature, of readily isolating and purifying and excellent in safety and showing an ant-proof effect and an anti-septic effect on wood. CONSTITUTION:An anti-septic and ant-proof agent for wood, containing an alkyldimethylamine pentaborate of formula I obtained by reacting an alkyldimethylamine of formula II (R is 8-20C alkyl) with orthophosphoric acid and/or metaphosphoric acid or its hydrate as the active component and showing not only an anti-septic effect for wood but an white ant-proof effect. This drug is excellent in safety to human body and can be applied to an occurrence place of white ant, a nest thereof, an architectural member such as a foundation or a column, an architecture, the soil around it, etc., by coating, blowing, immersing, spraying, injecting, drenching, etc. This drug can also be used, e.g. for covering a water-proof sheet, a paving material, an electric wire or a cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antiseptic agent for wood, which is capable of not only preserving wood but also termites.

[0002]

2. Description of the Related Art With the recent diversification of wood utilization methods and changes in lifestyles, the need for wood preservatives and termites is ever increasing.
For example, in the recent residential environment, the wood used as a base or the like decays in a short period of time due to wood-destroying fungi such as Pleurotus cornucopiae, Pleurotus cornucopiae and Pleurotus cornucopiae. In addition, the damage of houses and trees by termites has been increasing in recent years.

This termite damage is caused by the high humidity under the floor,
It is likely to occur in the kitchen, bathroom or washroom. In such a high humidity place, the wood itself is likely to rot, and this rot is more likely to be damaged by termites.
Therefore, preserving wood is effective in controlling damage caused by termites.

Thus, at present, wood preservatives and termites have become indispensable agents as wood preservatives.

Conventionally known as wood preservatives are organic agents such as phenol compounds, organic halogen compounds, naphthenic acid compounds and tar compounds, and inorganic agents such as CCA containing chromium, copper and arsenic. Has been.

However, conventional organic drugs are generally highly toxic to humans and animals, and often have skin irritation and rash. It also has a strong odor and wood is colored. on the other hand,
Since the inorganic drug contains a harmful metal like CCA, there is a concern that it may adversely affect humans and animals. Further, wood treated with CCA has problems in disposal such as generation of harmful gas when incinerated.

The applicant of the present invention proposed in JP-A-2-36110 that the alkyldimethylamine tetraborate is useful as a preservative and anti-termite agent for wood.

However, in order to produce the alkyldimethylamine tetraborate, the reaction temperature is set to a high temperature (140
C. to 150.degree. C.), and it is difficult to isolate and purify the produced alkyldimethylamine tetraborate.

Therefore, an object of the present invention is to provide an antiseptic and antifungal agent for wood containing as an active ingredient a compound which can be synthesized at a relatively low temperature, is easy to isolate and purify, has high safety, and has high antiseptic and antitermite activity. Is to provide.

[0010]

As a result of intensive studies conducted by the present inventors in order to achieve the above object, alkyldimethylamine pentaborate or its hydrate has high safety and is ant-proof.
The present invention has been completed by discovering that it has wood antiseptic properties.

That is, the present invention has the general formula [I]

[0012]

[Chemical 2] (In the formula, R represents an alkyl group having 8 to 20 carbon atoms) The present invention relates to an antiseptic and antifungal agent for wood containing an alkyldimethylamine pentaborate or a hydrate thereof as an active ingredient.

In the compound represented by the general formula [I], the alkyl group is, for example, an octyl, 2-ethylhexyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, octadecyl, icosyl group or the like. A chain or branched alkyl group may be mentioned. The alkyl group also includes an unsaturated hydrocarbon group such as an oleyl group.

The compound represented by the general formula [I] or a hydrate thereof has the general formula [II]

[0015]

[Chemical 3] It is obtained by reacting an alkyldimethylamine represented by the formula (wherein R is the same as above) with orthoboric acid and / or metaboric acid.

Specific examples of the alkyldimethylamine represented by the general formula [II] include carbons such as octyldimethylamine, decyldimethylamine, lauryldimethylamine, tetradecyldimethylamine, cetyldimethylamine and octadecyldimethylamine. Number 8-20
And dimethylamine having an alkyl group of.

The alkyldimethylamine may be reacted with at least one component of orthoboric acid and metaboric acid, and may be reacted by mixing orthoboric acid and metaboric acid. Usually, it is preferable to use orthoboric acid.

The reaction is usually carried out in the presence of a solvent. As the reaction solvent, it is preferable to use a solvent in which at least the reaction product, alkyldimethylamine pentaborate, is soluble. This reaction solvent may not be soluble in the alkyldimethylamine, orthoboric acid and / or metaboric acid as the reaction raw materials.

Examples of such a solvent include water, alcohols, ketones, N-methylpyrrolidone, N, N-dimethylformamide, dimethylsulfoxide, and mixed solvents thereof. Examples of the alcohols include, for example, methanol, ethanol, propanol,
Examples thereof include aliphatic alcohols having 1 to 6 carbon atoms such as isopropanol, butanol, pentanol, and hexanol. Examples of ketones include acetone, methyl ethyl ketone, and diethyl ketone.

The reaction of alkyldimethylamine with orthoboric acid and / or metaboric acid is, for example, 0 to 140.
℃, preferably 0 to 100 ℃, more preferably 20 ~
It is carried out at about 60 ° C.

The amount of orthoboric acid and / or metaboric acid used with respect to alkyldimethylamine is usually 0.8 to 1.2 times, preferably equimolar, in terms of pentaboric acid.

The reaction time cannot be unconditionally determined because it depends on the reaction temperature, but it can be judged that the reaction is completed when the reaction system becomes a homogeneous phase. The reaction is usually completed within a short time of about 5 minutes to 2 hours.

The alkyldimethylamine pentaborate or its hydrate can be easily isolated by subjecting the reaction product to a conventional isolation and purification means. Examples of the isolation and purification operation include simple methods such as atmospheric pressure or reduced pressure drying. When a solvent having a high boiling point is used, it can be isolated by a reprecipitation operation using ethyl acetate, benzene, toluene, xylene or the like as a solvent.
When the reaction product contains unreacted components, the unreacted components can be easily removed by a conventional method such as extraction or reprecipitation.

The product obtained is usually a white powder. From the results of elemental analysis and infrared spectrum, the product is usually an addition salt in which alkyldimethylamine and pentaboric acid are combined at a molar ratio of 1: 1. This addition salt usually exists as a hydrate, and the degree of hydration changes depending on the drying conditions.

The alkyldimethylamine pentaborate represented by the above-mentioned general formula [I] or its hydrate has a high growth inhibitory activity against wood-destroying fungi such as Pleurotus cornucopiae, Namitake mushrooms, Kawaratake mushrooms, etc. It has a high insecticidal power against. In addition, the above compound is a highly safe borate, does not contain harmful metals, has no irritation to the skin and has no bad odor, and is highly safe for humans and animals.

The antiseptic agent for wood, as long as it contains the compound represented by the general formula [I] or a hydrate thereof,
The form is not particularly limited. The compound or its hydrate can be used, for example, in the form of powder, or can be used as a solution or dispersion liquid dissolved in water.

The antiseptic agent for wood can also be used as an oil agent in which the compound represented by the general formula [I] or a hydrate thereof is dissolved in a suitable organic solvent, and a binder such as an aqueous emulsion or a solvent type is used. It can also be used as a mixture with paint. As the organic solvent, various solvents such as alcohols, hydrocarbons, esters, ketones and ethers can be used. Examples of the binder include conventional synthetic resins such as acrylic polymers, styrene polymers, polyester polymers, vinyl acetate polymers, vinyl chloride polymers, chlorinated polypropylene, polyurethane polymers and chlorinated rubber. The concentration of the compound represented by the general formula [I] or a hydrate thereof in the antiseptic agent for wood and the amount of the antiseptic agent used are the form of the antiseptic agent and the treatment of the antiseptic agent. It can be appropriately selected depending on the method. When the antiseptic agent for wood is a liquid, the concentration of the compound or its hydrate is usually 0.1 to 20% by weight, preferably about 1 to 10% by weight. The content of the binder is usually 1 to 50% by weight, preferably 5 to 10% by weight.

The antiseptic agent for wood according to the present invention is applied, sprayed, dipped, injected, sprayed on a termite generation site, a nest, a base, a building member such as a pillar, a building, and surrounding soil.
It can be used by kneading. It can also be used as a waterproof sheet, pavement material, coating of electric wires or cables, and the like.

[0029]

EFFECT OF THE INVENTION The antiseptic agent for wood of the present invention is highly safe for humans and animals because it contains alkyldimethylamine pentaborate or its hydrate as an active ingredient, and suppresses the growth of wood-destroying fungi, Moreover, since it has an insecticidal action and a repellent action against termites, it can impart extremely high antiseptic and anti-termistic properties to wood.

[0030]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited to these examples.

Production Example In a 300 ml three-necked flask equipped with a stirrer, a reflux condenser and a thermometer, 92 g of water and 21.3 g of lauryldimethylamine were placed.
(0.1 mol) was added, the mixture was heated to 40 ° C., and 30.9 g (0.5 mol) of orthoboric acid was gradually added with stirring. About 30 minutes after the start of the reaction, the reaction solution became homogeneous.

The reaction solution was vacuum dried at 120 ° C. for 3 hours to obtain 39.6 g of white powder (yield 100%).

NMR σppm (DMSO-d6): 0.
8 (3H, t), 1.20 (18H, s), 1.60
(2H, b), 2.70 (6H, s), 3.00 (2
H, t) Elemental analysis values and solvent solubility of this reaction product are shown in Table 1 and Table 2, respectively. In Table 1, the quantification of B is based on the quinalizarin absorptiometry.

[0034]

[Table 1]

[0035]

[Table 2] From the elemental analysis values, the reaction product is estimated to be an anhydrate of lauryldimethylamine pentaborate shown by the following formula.

[0036]

[Chemical 4] The infrared absorption spectra of the reaction product obtained in Production Example and the infrared absorption spectra of ammonium pentaborate and ammonium tetraborate were compared, and the reaction product obtained in Production Example was lauryl. Absorption wave numbers related to dimethylamine 2920 cm ^-1 , 2850 cm ^-1 , 2650
Except for cm ^-1 , it showed almost the same absorption characteristics as ammonium pentaborate and different absorption characteristics from ammonium tetraborate.

As a result of testing the safety of this reaction product, LD ₅₀ was 1995 mg / kg, and the Ames test was negative.

Example 1 (Wood antiseptic test) Six kinds of chemical solutions each having the composition shown in Table 3 and containing the compound obtained in Production Example, resin and water or an organic solvent were prepared. An acrylic resin (MR-3725, manufactured by Mitsubishi Rayon Co., Ltd.) and an aqueous emulsion (Sebian, manufactured by Daicel Chemical Industries, Ltd.) were used as the resin.

Sugi sapwood is 20 mm wide and 20 mm long,
A piece of wood having a thickness of 5 mm was prepared, and the surface of the wood was sealed with a room temperature curing type epoxy resin (two-pack type). This piece of wood was immersed in the above chemical solution for about 10 minutes, wiped gently, air-dried at room temperature for 1 day, and further dried at 60 ° C. for 4 hours.

Next, the wood piece treated with the chemical solution was subjected to weathering operation. For weatherproofing, 11.5 pieces of wood pieces treated with chemicals are used.
Pour into a desiccator of L volume and run water (2 L / min, 25 ° C ± 3
(° C) system for 5 hours for leaching and lightly draining, followed by volatilization for drying for 19 hours at 60 ° C. Each time the above operation was repeated, the water was replaced with fresh water. Finally, it was dried at 40 ° C. for 48 hours.

Wood pieces that had been weather-proofed as described above were used as samples (Sample Nos. 1 to 6), and the test fungi, Pleurotus cornucopiae and Pleurotus cornucopiae, were inoculated and cultured at 26 ° C. for 10 days. And, based on the growth area of the bacteria antibacterial,
The evaluation was performed according to the following criteria.

As a comparative sample, a piece of wood not treated with the chemical solution was used (Sample No. 7), and the same test as above was conducted.

Evaluation point 1 ... Growth area of bacteria is 1/3 or more of sample area 2 ... Growth area of bacteria is less than 1/3 of sample area 3 ... No growth of bacteria is shown in Table 3 Shown in.

[0044]

[Table 3] From Table 3, the compounds of Production Examples showed high antibacterial activity against both wood decay fungi of Pleurotus cornucopiae and Pleurotus cornucopiae.

Example 2 (Termite-proof test) Normal pine and rice sap sapwood were planarized on each side with a planer to obtain rectangular parallelepiped wood pieces of about 5 cm x 5 cm x 1.5 cm, which were manufactured. An emulsified water solution containing 5% by weight of the compound of the example was impregnated for 1 hour and dried at 60 ° C. until a constant temperature was reached.

Soil was placed in a cylindrical glass container having a diameter of 8 cm and a height of 6 cm up to a height of about 4 cm. 200 Yamato termite worker ants and 4 soldier ants were placed in the soil, and one of each of the above wood pieces was placed. Placed horizontally. After standing for 21 days for rearing, it was observed whether the wood pieces were damaged by termites.

As a comparative sample, the same test was conducted using the above-mentioned wood pieces as they were without impregnating them with the emulsified water solution.

As a result, in the case of the comparative sample, the food damage was remarkable, but the wood pieces impregnated with the emulsified water solution containing the compound of Production Example had no food damage at all.

Claims (1)

[Claims] 1. A compound represented by the general formula [I]: (In the formula, R represents an alkyl group having 8 to 20 carbon atoms) An alkyldimethylamine pentaborate or a hydrate thereof is used as an active ingredient.