JPH04244003A - Fungicide for wood - Google Patents

Abstract

PURPOSE:To provide a new antifungal agent having a large synergistic effect, capable of exhibiting an extremely large antifungal effect at a small dose and used for wood. CONSTITUTION:The subject agent contains 4,5-dichloro-2-n-octyl-4-isothiazolon-3- one and 2,4,6-trichlorophenol as active ingredients.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fungicide for wood to prevent deterioration of wood due to mold growth.

0002

[Prior Art] 2,4,6-Trichlorophenol (hereinafter sometimes referred to as TCP) is a chemical that has been known as a fungicide for wood, but its antibacterial spectrum is limited. There is also a problem that when the concentration at the time of use is low, the efficacy is weak, and on the other hand, when the concentration is too high, various chemical harms occur. Also, 4,5-dichloro-2-
n-octyl-4-isothiazolin-3-one (hereinafter referred to as
DOIO) has the disadvantage that it is expensive and uneconomical to use at effective concentrations.

0003

[Problems to be Solved by the Invention] In view of the fact that conventional wood fungicides have been unsatisfactory in terms of effectiveness and cost, the present invention has been made to develop a new wood fungicide that does not have these drawbacks. The purpose is to provide a fungicide.

0004

[Means for Solving the Problems] The purpose of the present invention is to
This is achieved by a wood fungicide characterized by containing 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and 2,4,6-trichlorophenol as active ingredients. Furthermore, in such a wood fungicide, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and 2,4,6-trichlorophenol are mixed in a weight ratio of 1:200 to 1: By containing within the range of 2, a synergistic antifungal effect superior to that of either agent alone can be exhibited.

[0005]

[Example] A particle board measuring 3 cm in length x 3 cm in width x 0.6 cm in thickness was immersed for 3 minutes in each chemical solution having the composition shown in Table 1, and the adhesion amount of the chemical solution was 200-250.
Five test specimens each having a range of g/m2 were prepared. After thoroughly air-drying such a test specimen, a polyethylene net was placed on a PDA agar medium set in a petri dish, and the above-mentioned test specimen was placed on top of the polyethylene net, and the mold shown below was separately cultured on a PDA agar medium. 2 ml of the mixed spore suspension prepared from above was sprayed on each of the test tubes. Each petri dish was covered with a lid and cultured for one month in a constant temperature chamber at 26°C. The degree of mold growth on the surface of the specimen was observed, and the efficacy of the drug was evaluated according to the evaluation method described below.

[Table 1] Table 1 (Parts by weight) ──────────
────────────────────────
Drug TCP DOIO N
aOH SAA Water Total
──────────────────────────
────────── A 1.0
0.1 0.2
0.4 remaining 100
B 1.0 0.0
5 0.2 0.4
100 C remaining
2.0 0.1
0.4 0.4 Remaining
100D 2.0
0.05 0.4
0.4 remaining 100
E 1.0 0.01
0.2 0.4
100F left
1.0 0.005 0
．． 2 0.4 remaining
100G 0.5
0.1 0.1
0.4 remaining 100
H 0.5 0.05
0.1 0.4
Remaining 100 I 0.
2 0.1 0.0
5 0.4 remaining 1
00 J* 2.0 ─
─ 0.4 0.4
100K left*
1.0 ---
0.2 0.4 Remaining
100 L* 0.5
─ 0.1
0.4 remaining 100M
*──0.1
─ 0.4 remaining
100 N*──
0.05 --- 0
．． 4 100 remaining ────
──────────────────────────
─────TCP: 2,4,6-trichlorophenol DOIO: 4,5-dichloro-2-n-octyl-
4-isothiazolin-3-one NaOH: Sodium hydroxide SAA: Nonionic surfactant*: Comparative example

[0006] Test mold Aspergillus niger
s niger) Trichoderma virida (Tr.
ichoderma viride) Aureobasidium bullans (Aureobasidium
pullulans ) Penicillum citrium ( Penicillum
citrium) Rhizopus nigricans
(Rhizopus nigricans)

0007
[Evaluation Method] Each mold-infested specimen was given a damage value score according to the following criteria, and the total score of the five was calculated to determine the degree of damage X for the chemical-treated specimen.

[0008] Criteria for determining damage value: ---
──────────────────────────
─ 0: No mold growth is observed on the surface of the test specimen. 1: Mold growth is observed only on the side surfaces. 2: 〃 On 1/3 or less of the top surface. 〃 3: 〃
More than 1/3 of the top surface 〃 ────
────────────────────────

[
[0009]Furthermore, a similar test was conducted on the untreated test specimen to determine the degree of damage X0, and from the damage degree The mold index was calculated.

[Formula 1]

The results of the test thus obtained are shown in Table 2, and these results show that 1.0 part of TCP (drug K*
) is 0.1 part of DOIO (drug M*) and also TC
0.5 part of P (drug L*) is 0.05 part of DOIO (
It can be seen that each drug has the same effect as the drug N*). Furthermore, drug B, which corresponds to a 1:1 mixed composition of drug J* and drug M*, and drug H, which corresponds to a 1:1 mixed composition of drug K* and drug M*, both correspond. It can also be seen that it exhibits an extremely superior synergistic effect compared to the comparative drug.

[Table 2]
Table 2 ────────
────────────────────────
Drug Damage value of test specimen
Damage level Mold prevention index ─
──────────────────────────
──── A
0,0,0,0,1 1
93B
0,0,1,1,1
3 80
C 0,0,0,0
,0 0
100D
0,0,0,0,1 1
93
E 0,0,1,1,2
4 73
F 1, 2, 2
,2,3 10
33 G
0,1,1,2,2
6 60
H 0,0,0,1,1
2 8
7 I 1,1
,2,3,3 10
33 J*
1, 2, 2, 2, 2
9 40
K* 2, 2, 2, 3, 3
12
20 L* 2
,2,3,3,3 13
13 M*
2, 2, 2, 3, 3
12 20
N* 2, 2, 3, 3,
3 13
13 ─── 3
,3,3,3,3 15
−− ───────
────────────────────────
─── : Without chemical treatment

0011
]

[Effects of the Invention] The wood fungicide of the present invention exhibits a great synergistic effect by combining chemicals that have been known in the past but had problems in practical use in terms of effectiveness and economy. It has the feature of being able to obtain extremely high antifungal effects even when used in small amounts.

Claims (2)

[Claims] [Claim 1] A fungicide for wood, characterized by containing 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and 2,4,6-trichlorophenol as active ingredients. agent. Claim 2: Contains 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and 2,4,6-trichlorophenol in a weight ratio of 1:200 to 1:2. The wood fungicide according to claim 1, characterized in that: