JP3086110B2 - Wood mold treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating fungi on wood products.

[0002]

2. Description of the Related Art As shown in the Handbook of Bactericidal and Fungicide (Gihodo Shuppan, edited by the Japan Society of Bactericidal and Fungicide), in order to prevent mold, generally, a fungicide is mixed into a paint and the fungicide is used. A method for suppressing the growth of E. coli has been adopted. Similarly, preservatives have been provided by impregnating wood with a preservative. However, many of the chemicals used here are toxic to the chemicals themselves, and it is necessary to give consideration to the health of processing workers and product users. In addition, the types of bacteria to be treated are different between "antifungal" and "antiseptic", which are usually called, and even if they have an effect on "antiseptic", they do not always have an effect on "antifungal".

[0003] Particularly, in the case of chemically processed wood, wood
Wood and cell chemistry
ulosic chemistry) (Marcel Dekk
As shown in erINC., ISBN 0-8247-8304-2), it generally shows decay resistance. In the book, Lentinus lepidide (Lentinus lepideus), Gleophyllum (Gleophyllum),
It explains the decay resistance of chemically processed wood for rot fungi such as lus versicolor). Further, Japanese Patent Application Laid-Open No. 64-800
No. 1, JP-A-63-147602, JP-A-63-17
No. 6101 and Japanese Patent Application Laid-Open No. 63-199604 also disclose that the decay resistance of wood is improved by chemical processing, but the improvement of performance with respect to "mold prevention" has been confirmed. It has not been. In particular, Japanese Patent Application Laid-Open No. 64-8001 discloses a similar chemical treatment method for the purpose of stabilizing the dimensions, but does not examine the antifungal property.

[0004]

SUMMARY OF THE INVENTION It is possible to improve the dimensional stability and decay resistance of wood by chemical processing.
However, general chemical processing cannot impart mold resistance, and to impart mold resistance, it was necessary to further treat the mold. Chemically processed wood chemically modifies cellulose, the main component of wood, to suppress the absorption of moisture,
Reduces fiber saturation point. Therefore, even in a high humidity atmosphere, the cellulose maintains a state close to the dried cellulose. Also, the modified cellulose is less susceptible to enzymatic degradation. For these reasons, chemical processing can provide wood with resistance to fungi and insects that feed on cellulose. However, it has no effect on molds that do not feed on cellulose directly.

[0005] In JIS Z2199 "Wood decay test method", Japanese syrup (Tyromyces palustr
is) and Coriolus versicolor are specified to be used as test bacteria. On the other hand, JIS Z2
911 "Mold resistance test method" includes Aspergillus niger van Tieghem, Penicillium funiculosum T
hom), Rhizopus oryzae Went et Pr
insen-Geerligs), Gliocladium Willens (Gl
It is specified to use iocladium virens Miller), ketomiumglobosum Kunze ex Fries, etc., and the bacterial species used are completely different. In addition, Wood Conservation Society, Standard No. 2, 1979 "Testing method for fungicide efficacy of fungicide for wood", Aspergillus niger (Aspergillusniger van Tieghem),
Penicillium funiculosu
mThom), Rhizop
us japanicus Takeda), Aureobasidium pullulans Arnaud
), Gliocladium vir
ens Miller), and the bacterial species are different. Further, in the test methods, the decay test method and the mold prevention test method are completely different.

[0006] In particular, as a fungus species having aesthetically significant problems as a mold of wood, Gliocium virens (Glioc
ladium virens Miller), Aureobasidium pullulans Arnaud
) And the like. These molds are dirty molds that propagate on plaster, concrete, synthetic resin, etc.
It also propagates in chemically processed wood and significantly degrades its appearance. Also, Rhizopus is a bacterial species that is difficult to control the growth with normal fungicide paints.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a chemical processing method and processing conditions for imparting dimensional stability and decay resistance as well as mold resistance. It is a further object of the present invention to provide a method for treating fungi on wood, which has high safety of chemicals used, is easy to handle, and hardly affects the health of workers and product users.

[0008]

According to the present invention, in order to solve the above-mentioned problems, wood is impregnated or coated with a treatment liquid containing a mixture or condensate of a polyhydric carboxylic acid or a derivative thereof and a polyhydric alcohol. After that, heat treatment and wood treatment
A fungicide treatment method for wood, wherein the weight increase rate is 5% or more and 35% or less .

The polycarboxylic acids used in the present invention include dicarboxylic acids such as malonic acid, maleic acid, fumaric acid, succinic acid, adipic acid, phthalic acid, anhydrides and derivatives thereof, and trimellit. Trivalent carboxylic acids such as acids,
Examples thereof include anhydrides and derivatives thereof, tetravalent carboxylic acids such as pyromellitic acid, and anhydrides and derivatives thereof. The polyhydric alcohol used in the present invention includes ethylene glycol, diethylene glycol, dihydric alcohols such as propylene glycol, trihydric alcohols such as glycerin, various saccharides, sugar alcohols and the like, and further polyols such as polyvinyl alcohol and the like. Can be used.
Best results are obtained, especially when using maleic acid and glycerin.

After mixing the polyhydric carboxylic acid and the polyhydric alcohol, an appropriate solvent is added to prepare a treatment liquid. After impregnating or applying the treatment liquid to the wood, the wood is dried and heated in a heating furnace to a predetermined temperature. The treatment temperature is set to a temperature equal to or higher than the temperature at which esterification proceeds during heating and equal to or lower than the temperature at which wood is thermally decomposed. Actually, the temperature is desirably 100 ° C. or more and 160 ° C. or less. In addition, the rate of weight increase of the wood by the treatment is 5
% Is preferably set to 35% or less. The solvent is a solvent that can dissolve both the polyvalent carboxylic acid and the polyhydric alcohol, and is not particularly limited as long as its boiling point can be set to be equal to or lower than the decomposition point of wood. In particular, when water is used as the solvent, it has excellent solubility in polycarboxylic acids and polyhydric alcohols, has a high affinity for cellulose, which is a main component of wood, and has excellent processing properties. The operation is easy in impregnating the treated wood with the treatment liquid and in the heat treatment.

[0011]

The present inventors have conducted intensive studies on chemical processing and fungicide of wood. As a result, the wood was impregnated or coated with a processing solution containing a polyvalent carboxylic acid and a polyhydric alcohol, and then heated. By doing so, an esterification reaction occurs, which blocks the hydroxyl groups of cellulose, which is the main component of wood, and imparts dimensional stability and decay resistance to wood, and condensates of polycarboxylic acids and polyhydric alcohols are formed. The present inventors have found that this exhibits an excellent fungicidal effect, and have completed the present invention.

Regarding the fungicidal action of the treatment of the present invention,
Explaining specifically based on test examples, FIG. 1 shows the results of an efficacy test performed on a sample obtained by subjecting a bushing material to a fungicide treatment with maleic acid and glycerin. According to the Wood Conservation Society, Standard No. 2, 1979 “Testing method for fungicide efficacy of fungicides for wood”, Aspergillus niger
lus niger van Tieghem), Penicillium funiculosum Thom, Rhizopus japanicus Takeda, Aureobasidium prunuls Arnaud (Aureobasi)
Efficacy tests were carried out on five types of bacteria, G. dium pullulans Arnaud and Gliocladium virens Miller. In the usual evaluation by the "test method for fungicide efficacy of fungicides for wood", no mold was generated at all, and evaluation was impossible. Therefore, a mold spore suspension was directly inoculated on a test piece, and the damage value was determined from the growth state of the mold 28 days later by the method of "Testing method for fungicide efficacy of fungicide for wood". In such a severe test method, a commercially available fungicide can provide a damage value of about 30%. With the method according to the invention, damage values of up to 25% were obtained, indicating excellent mold protection. In addition, Rhizopus, which is difficult to control with conventional fungicides, exhibited excellent fungicidal properties. In addition, regarding the fungicidal effect, there is an optimum weight increase rate for the weight increase rate due to the treatment, and the efficacy decreases before and after that. As shown in FIG.
It is understood that a value of not less than% and not more than 35% is appropriate. In the present invention, a treatment with a fungicide may be used in addition to the treatment according to the present invention.

[0013]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples, but it goes without saying that the present invention is not limited to the following Examples.

Example 1 Maleic anhydride and glycerin were mixed in a weight ratio of 3: 2,
A treatment liquid was prepared using water as a solvent. 50m of this treatment liquid
A test piece of a m × 20 mm × 3 mm bun was impregnated, dried, and then heat-treated at 160 ° C. The weight increase rate of the test piece was 15%. Wood Preservation Association, Standard No. 2, 19
79 In accordance with "Testing method for fungicide efficacy of fungicides for wood",
Five kinds of fungi were tested for fungicide resistance. That is, mold spores were inoculated on the agar medium, and after the mold had developed on the medium, test pieces were placed. According to the standard, the occurrence of mold after the test piece was installed was visually evaluated. Example 2 In addition to the treatment in Example 1, a test piece coated with a commercially available fungicide was subjected to a fungicide test in the same manner as in Example 1.

Comparative Examples 1 and 2 At the same time as Examples 1 and 2, a wood specimen was used for comparison by using an untreated rugged test piece (Comparative Example 1) and a test piece coated with a commercially available fungicide paint (Comparative Example 2). Conservation Society, Standard No. 2, 1
Five kinds of fungi were evaluated for fungicidal activity according to 977 "Testing method for fungicide efficacy of fungicide for wood".

Test results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in FIGS. As is clear from the results shown in FIGS. 2 to 6, the occurrence of mold was confirmed in the untreated test piece immediately after the test piece was placed. In addition, the occurrence of mold was confirmed on a test piece treated with a commercially available fungicide paint. In contrast, Examples 1 and 2 processed according to the present invention
Until the end of the test, the test piece showed almost no mold generation and exhibited excellent mold prevention. In particular, Rhizopus (Rhi
zopus) also showed excellent mold protection.

[0017]

As described above, the chemically processed wood treated by the fungicide treatment method of the present invention has improved dimensional stability and decay resistance as well as ordinary chemically processed wood. It shows excellent fungicidal properties, and has excellent fungicidal effects even against lysopus and gliocladium species, which are ineffective with commercially available fungicides. Further, the chemicals used in the present invention are highly safe, easy to handle,
It is easily available industrially. In particular, when maleic acid and glycerin are used, the toxicity is extremely small, and water can be used as a solvent, and has little effect on the health of workers and product users. In addition, since water is used as a solvent, it has advantages such as high affinity with cellulose, which is a main component of wood, and excellent treatability.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a graph showing the results of a fungicide test conducted on a sample obtained by subjecting a bush material to a fungus treatment by the method of the present invention, and showing a relationship between a damage value due to the occurrence of mold and a weight increase rate due to the treatment.

FIG. 2 shows the test pieces of Examples 1 and 2 and Comparative Examples 1 and 2, aspergillus niger van
3 is a graph showing the results of a fungicide test on Tieghem).

FIG. 3 shows the test pieces of Examples 1 and 2 and Comparative Examples 1 and 2 for Penicillium funicu.
4 is a graph showing the results of a fungicidal efficacy test on Losum Thom).

FIG. 4 shows the test pieces of Examples 1 and 2 and Comparative Examples 1 and 2 for Rhizopus japonicus Takeda.
3 is a graph showing the results of a fungicidal efficacy test on Anicus Takeda).

FIG. 5 shows the test pieces of Examples 1 and 2 and Comparative Examples 1 and 2 for Aureobasidium pullulans Arnaud (Au).
4 is a graph showing the results of a fungicidal efficacy test on reobasidium pullulans Arnaud).

FIG. 6 shows the test pieces of Examples 1 and 2 and Comparative Examples 1 and 2 in terms of Gliocladium vire.
5 is a graph showing the results of a fungicide test on ns Miller).

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-64-8001 (JP, A) JP-A-1-226302 (JP, A) JP-A-1-182002 (JP, A) JP-A-51- 1603 (JP, A) JP-A-49-61330 (JP, A) JP-A-1-255502 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27K 3/50

Claims (4)

(57) [Claims] 1. A method in which wood is impregnated or coated with a processing solution containing a mixture or condensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol, and then heat-treated for weight of the wood.
A fungicide treatment method for wood, wherein the rate of increase is 5% or more and 35% or less . 2. The method according to claim 1, wherein the polycarboxylic acid is maleic acid and the polyhydric alcohol is glycerin. 3. The method according to claim 1, wherein the temperature of the heat treatment is 100 ° C. or more and 160 ° C. or less. 4. The mixing ratio of maleic acid and glycerin is 3:
3. The method according to claim 2, wherein the method is a fungicide treatment for wood.