JP2003277207A - Antifungal and anti-discoloring-fungus composition for wood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that there is a demand for a further effective antifungal and anti-discoloring-fungus agent because discoloring bacteria outside the conventional antifungal spectra emerges in spite of attempts of combining various antifungal agents or to stabilize antifungal spectra, the enhancement of effectiveness, etc. <P>SOLUTION: It has been found out that when combining the three compounds of 4,5-dichloro-2-n-octylisothiazolin-3-one, methyl 2-benzimidazolecarbamate and methylenebisthiocyanate as the active ingredient, the combination exhibits improved antifungal effectiveness as compared with the case in which they are used singly or in the form of a two-component mix, and exhibits an excellent effectiveness also against wood discoloring fungi. It has been further found out that when 3-iodo-2-propynylbutyl carbamate is added to the above three compounds, the resultant antifungal agent exhibits markedly improved antifungal effectiveness and exhibits effectiveness also against wood discoloring fungi. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-mold anti-mildew and anti-coloring fungus composition used to prevent mold and tarnishing bacteria from occurring in wood.

[0002]

2. Description of the Related Art Conventionally, halogenated phenol compounds and organotin compounds have been widely used as antifungal agents for wood. However, since these compounds have strong acute and chronic toxicity and are relatively hard to decompose, there is concern about secondary pollution due to accumulation, and these wood fungicides have become unsuitable for use. Therefore, the development of safer antifungal agents for wood has been actively conducted. 3-Iodo-2-
Compounds such as propynyl butyl carbamate (hereinafter abbreviated as IPBC) have been provided, and are often added to prevent the formation of mold on wood. However IP
The use of a single component of BC alone does not provide sufficient efficacy due to the limited number of species of microorganisms having efficacy, the amount of drug used is often increased, and the cost is often high. Also, 4,
5-Dichloro-2-n-octylisothiazolin-3-one (hereinafter abbreviated as COIT) and methyl 2-benzimidazole carbamate (hereinafter abbreviated as BCM) are known as highly safe industrial fungicides. However, when it is applied alone, resistance of microorganisms often occurs, and therefore, sufficient efficacy cannot be obtained unless the application concentration is considerably high, and it is remarkably lacking as an antifungal agent.

[0003]

For this reason, attempts have been made to combine various antifungal agents to stabilize the antifungal spectrum and enhance the antifungal effect. Usually, either one of the effects will be manifested. The reality is that only additive effects can be obtained. For example, JP-A-63-41405 discloses a method in which sodium 1,4-bis- (2-ethylhexyl) sulfosuccinate is used as a stabilizer in the IPBC, and JP-A-2-164803 discloses the IPBC and benzimidazole. There has been proposed a method of using a system compound as a mixture. Further, JP-A-3-251508 describes a method of using a mixture of a benzimidazole compound and an isothiazoline compound,
Further, JP-A-7-133205 proposes a method of combining COIT and IPBC. However, fungi occurring on wood include fungi and discoloring fungi, and recently, many damages by discoloring fungi have been observed. Therefore, a drug having a broader antibacterial spectrum that is effective against these substances has been desired.

[0004]

[Means for Solving the Problems] The present inventor has conducted extensive studies as to a composition for anti-mold and anti-mildew wood that compensates for the lack of efficacy. It was found that the antifungal effect is dramatically increased and the antifungal agent is effective against discoloring bacteria when compared with the case of using them alone or as a mixture of two kinds. Further in the composition of the present invention
The present invention has been completed by finding that the addition of IPBC enhances the efficacy of antifungal and anti-tarnish bacteria. That is, the present invention
Three types of IT, BCM and MBTC, or IPBC, COIT, BCM and MBTC
The antifungal and anti-tarnish composition for wood is characterized by containing the following 4 kinds as an active ingredient.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The antifungal composition for wood of the present invention can be directly applied depending on the purpose of use, but it is generally used as a formulation such as an oil, an emulsion, a paste and a suspension. To do. The polar solvent used in the case of formulation, glycol solvents such as ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, hexylene glycol, polyethylene glycol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono A glycol ether solvent such as butyl ether, an alcohol solvent such as isopropyl alcohol and ethanol, a solvent such as dimethylacetamide, dimethyl sulfoxide, γ-butyrolactone, methyl ethyl ketone or water can be used. These may be used alone or in combination of two or more.

Examples of the nonpolar solvent include plasticizers such as dioctyl phthalate and diisononyl phthalate, xylol,
Toluene, isophorone, phenylxylylethane, diethylene glycol monobutyl ether acetate, propylene carbonate, liquid paraffin, kerosene, palm oil,
Solvents such as rapeseed oil, cottonseed oil, castor oil or soybean oil can be used. These may be used alone or in combination of two or more. Further, two or more kinds of polar solvent and non-polar solvent may be combined. The surfactant may or may not be used, and when it is used, any of a nonionic surfactant, an anionic surfactant, a cationic surfactant and a zwitterionic surfactant may be used. Absent.

Examples of nonionic surfactants include polyoxyethylene alkyl phenyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and the like. Examples of the activator include alkylbenzene sulfate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkylphenyl ether sulfate, and dialkyl sulfosuccinate. As the cationic surfactant, aliphatic amine salt and its quaternary ammonium salt are used. Examples of amphoteric surfactants include, but are not limited to, betaine surfactants and aminocarboxylic acid salts.

These nonionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants may be used alone or in combination of two or more. Good. The content ratio of the active ingredient in the composition of the present invention is not particularly limited, but the mixing ratio of BCM and COIT is 10: 1 to 1:10, preferably 5 :.
It is 1 to 1: 5, and the mixing ratio of the total amount of BCM and COIT and MBTC is 10: 1 to 1:10 by weight ratio, preferably 5:
1 to 1: 5, the total amount of BCM, COIT, and MBTC, and the blending ratio of IPBC is 10: 1 to 1:10 by weight, preferably 5:
It is 1 to 1: 5. It is also possible to mix and use other fungicides, bactericides, insecticides, rust preventives, deterioration inhibitors and the like.

[0009]

EXAMPLES Examples and comparative examples of the present invention will be described below, but the present invention is not limited thereto. All of the compounding ratios shown below are% by weight.

Table 1 shows the fungicidal and anti-tarnish fungus compositions for wood of Examples 1 to 3 and Comparative Examples 1 to 11. Comparative Examples 1, 3, 4,
Nos. 5, 7 and 9 were anti-fungal and anti-tarnish fungi compositions with the mixing ratios shown in Table 1 at room temperature by ordinary stirring. In addition, Examples 1, 2, 3 and Comparative Examples 2, 6, 8, 10, and 11 were mixed in the composition shown in Table 1, mixed with glass beads having a diameter of 1 mm, pulverized for about 15 minutes, and filtered with a wire mesh. As a result, a mold-proof and anti-tarnish disperse composition was obtained.

[0011]

【table 1】 * 1: Polyoxyethylene styryl phenyl ether * 2: Propylene glycol

Test Example 1 Antifungal test of wood Dilute the bay pine sapwood (2 cm x 5 cm x 0. 3 cm) for 30 seconds and then air dried. This test piece was placed on a potato dextrose agar medium (hereinafter referred to as PDA medium), and 1 ml of a mixed spore suspension of mold was sprinkled on the medium and cultured at a temperature of 26 ° C. and a humidity of 95% for 28 days. As the test bacteria, Aspergillus niger, Penic
illium funiculosum, Aureobasidium pullulans, Glioc
ladium virens, Cladosporium cladosporioides and Neu
rospora sp. was used. The results are shown in Table 2. However, the indication of the degree of mold growth was based on the following criteria.

-: No mold growth is observed on the test piece. +: Mold growth is recognized on the side surface of the test piece. ++: The area of mold growth on the test piece is 1 / of the total area
It is less than 3. ++: The area of mold growth on the test piece is 1 of the total area
/ 3 or more

Test Example 2 Test for anti-discoloring bacterium of wood A non-treated bay pine (bait tree) sterilized with ethylene oxide gas is placed on a petri dish in which the PDA medium is solidified. 2 ml of a spore suspension of the wood discoloring fungus Ceratocystis sp. Was added dropwise thereto, and precultured at 26 ° C. and 90% relative humidity for 2 weeks. on the other hand,
After dipping the test piece into a solution of the antifungal and discoloration fungal composition for wood of Examples and Comparative Examples diluted with water to a specified concentration for 30 seconds, pine sapwood (2 cm × 5 cm × 0.3 cm) was soaked Air dry. After the pre-culture, the drug-treated test body was placed on the bait tree on which the fungus had grown, and cultured at 26 ° C. and 90% relative humidity for 28 days. The results are shown in Table 2. However, the indication of the degree of growth of the color-changing bacterium was based on the following criteria.

-: No growth of discoloring bacteria is observed on the test piece. +: Growth of discoloring bacteria is recognized on the side surface of the test piece. ++: The area of the part where the discoloring bacteria develop on the test piece is 1 of the total area
It is less than / 3. +++: The area of the developing portion of the discoloring bacterium on the test piece is 1/3 or more of the total area.

[0016]

[Table 2] As is clear from the results in Table 2, the composition of the present invention was found to be significantly more effective against fungi and discoloration bacteria than the comparative examples.

[0017]

INDUSTRIAL APPLICABILITY The composition of the present invention exhibits a high fungicidal and anti-discoloring bacterium effect against fungi and discoloring fungi generated on wood, and is suitable as a fungicide and anti-discoloring agent for wood.

Claims (2)

[Claims] 1. A wood fungicidal and discoloration preventive composition comprising 4,5-dichloro-2-n-octylisothiazolin-3-one, methyl 2-benzimidazole carbamate and methylenebisthiocyanate. 2. The anti-mold and anti-tarnish composition for wood according to claim 1, wherein 3-iodo-2-propynylbutyl carbamate is used in combination with the active ingredient.