JP2010005875A - Antifungal agent for bamboo or the like and antifungal method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein when panels as an alternative to plywood panels much used in civil engineering and construction by utilizing end plate materials as a fence jointing material such as bamboo slats of pollution-free and natural material, fungi grow on the bamboo slats in conservation or use of them, and inhibits the value remarkably, and therefore growth of fungi has to be prevented by generally pressurizing or immersing-impregnating a chemically synthesized chemical for the slats before use, but such a chemical easily causes recent sick building syndrome. <P>SOLUTION: Boric acid produced naturally, liquid where suitable amount of bamboo vinegar or the like extracted from natural bamboo is added to the boric acid, or liquid where methyl alcohol is added thereto as a melt infiltration agent is used as a mixed antifungal chemical. For example, this mixed chemical is applied to the fungi prevented material such as bamboo or after being immersed-impregnated, it is dried by air. The bamboo or the like increases risibility against fungi through this treatment, and growth of fungi of the manufactured panel can be prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method of using a boric acid compound or the like for preventing generation of wrinkles of bundling bamboo ridges such as a panel using an end plate material used as a substitute for a plywood panel, which is frequently used for construction, civil engineering, and the like.

In traditional wooden houses, end boards such as cedar wood have been used as field boards for attics. Recently, plywood made by pressing imported wood with synthetic glue is often used for labor saving and price. These plywoods are said to induce sick house syndrome caused by the solvent of the glue material, and depending on the conditions, the thin component boards can easily corrode and cause structural destruction. The remaining meniscus plate obtained by cutting a square column from a natural log is used as an end plate material as a dimension material having a size less than a normal size, or becomes a chip material and becomes a papermaking raw material. In order to use it as an end plate material, it is efficient if a large number of sheets are combined into a panel. In view of this, there has been proposed a device in which plates are gathered in a size of 1.8 m (horizontal) or 0.95 m (vertical) and 0.45 m (normally used as a panel) and these are bundled with bamboo chins. (Patent Document 1) These use natural solid wood and have been evaluated for low cost and safety. However, the assembly of dissimilar materials causes the movement of moisture, which in turn induces the generation of wrinkles that are abolished on products. There is a danger of doing.
JP 2003-062812

    As described above, chemical synthetic chemicals that have been conventionally used for antiseptic and antifungal use cannot be used in houses constructed using non-polluting natural materials, including chemical synthetic glue. The object of the present invention is to achieve these objects using natural substances.

    The inventors of the present invention have conducted extensive experiments to solve the above-mentioned problems. As a result, end plate materials such as cedar and cocoons are used, and bamboo chin is suitable as a glue substitute material for connecting them. In order to prevent wrinkles, the present inventors have found that a mixed solution of boric acid and bamboo vinegar and a mixed solution obtained by adding methyl alcohol to the mixed solution are effective, and the present invention has been completed.

That is, the present invention includes the following inventions.
As a substitute for a plywood panel using synthetic glue often used in construction, civil engineering, etc., when connecting and bundling narrow boards with bamboo chin etc. without using glue material, the following protection is mainly used to prevent bamboo wrinkles. Invented the glaze and the anti-mold method,
(1) A bamboo antifungal agent obtained by adding bamboo vinegar or wood vinegar containing acetic acid to an aqueous solution containing boric acid.
(2) The bamboo antifungal agent according to (1), wherein methyl alcohol is added to the antifungal agent.
(3) An antifungal method in which the antifungal agent according to (1) or (2) is applied or infiltrated.

The present invention is intended to use pure natural materials instead of plywood panels using imported materials.
We paid attention to the fact that a panel in which end plate materials such as cocoons were fenced with bamboo chins, etc., spawned from the bamboo chin part soon after production and propagated to the nearby wood part, which did not look good and reduced its strength. This phenomenon occurs frequently during the rainy season, which is peculiar to Japan, but it significantly reduces the commercial value. By using the natural material-based antifungal treatment of the present invention, bamboo chin does not start even in high humidity inventory and maintains its commercial value, and even after being used as a component, can maintain the effectiveness of antifungal and insect repellent It is.

Among the materials related to the present invention, the main cedars and cocoons contain monoterpenes that exhibit the activity of inhibiting the growth of cocoons. On the other hand, there is little terpene content in the string of bamboo fences or cotton, hemp, palm, etc.
In particular, bamboo is said to be suitable for felling from autumn to early winter, as there is a word that is said to be cutting season. This indicates that the nutrient-rich growth period is easily violated by pests such as helminths. On the other hand, the selection of such harvesting time is difficult in business and is usually ignored in practice. For this reason, even if the storage period is short after production, when the temperature and humidity are in appropriate conditions, the connecting bamboo chin will start to spread and then spread to the whole xylem. The present invention prevents this.

In the present invention, the end plate materials of cedar and cypress are arranged in a certain shape, and a suitable groove is drilled in the lateral direction of the end plate material on the front or back surface, and bamboo chin with a slightly larger size is press-fitted into the inner surface of the groove. When the fence is connected, a panel made of natural materials is generated without using any synthetic glue. However, if it is left in the rainy season or high temperature and humidity conditions peculiar to Japan, it will occur in bamboo parts with fences connected to it, and the product value will be significantly impaired.
Generation of wrinkles can be suppressed by preliminarily drying the materials used. However, when a field board or the like is intended for use, it is usually used in an undried state in consideration of cost. In that case, even if it is dry bamboo, the water | moisture content of a xylem will move and will help generate | occur | produce a wrinkle.

  The moths that occur in bamboo chins are the following fungi: blue mold, black mold, spergillus flavus, white mold, mold and red mold. Initially black and blue spots are scattered, the density increases, followed by fungi and, depending on the location, red mold. It is said to be a sub-type of flagellum, zygomycetes, and fungi that do not turn mushrooms into yeasts and fruit bodies in fungal phylogeny, such as Aspergillus, Fusarium, Penicillium, and Mucor.

    Antifungal agents used to prevent the occurrence of such soot include benzimidazole (TBZ), N-haloalkylthio, (preventol) nitrile, pyridine (MSTCP), organic arsenic (binazine), Typical examples include isothiazoline (CMITZ) and organic iodine (DIMT). Many chemical agents such as tributyltin-pentachlorophenol (TBT-PCP) have been used alone or as a mixture for a long time for the purpose of controlling and preventing insects and insecticides peculiar to bamboo.

Although these drugs are said to have no effect on the human body under normal use conditions, they include problems that cannot be said to have nothing to do with sick house syndrome, which has recently become a social problem.
The use of such artificial chemicals has been disliked for recent health-oriented and natural style architectural ideas.

    In view of the above situation, the present inventors mainly use the fumigation method that has been used for anti-fouling for a long time, and perform treatments such as impregnation with natural product-derived coconut oil, wood vinegar, bamboo vinegar, boric acid, etc., degreasing with alkali, etc. The present invention has been achieved by repeating various experiments with the primary purpose of achieving the object in a simple and inexpensive manner as much as possible.

    In the conventional chemical immersion method, a method of immersing an object to be processed in a solution in which a chemical is dissolved in a normal temperature state or maintaining a high temperature and pressure in a pressure vessel to promote penetration of the chemical solution is employed. In order to achieve the purpose with as simple an operation as possible, the present inventors first select natural chemicals, create a mixture of these chemicals, and apply this to bamboo chin etc. or immerse it in the solution. After promoting penetration, it is lifted and air-dried to achieve its purpose.

The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to the following examples.

<Example 1> The bamboo used in the experiment is a commercially available bamboo chin (b) with a diameter of 5 mm and a newly harvested bamboo shoot with a diameter of about 10 cm, regardless of the season, cut to a length of about 15 cm and cut it into a width of 5 to 10 mm. What was cut | disconnected in the length direction and shape | molded (b) in the rod shape of a cross-sectional rectangle was used. This is because during the initial preliminary test, the commercial bamboo Higo control product showed better results than expected, so the possibility of artificial pretreatment was also considered for the commercial product. Mainly used.
In the experiment, using one bamboo chin (I) and two bamboo sticks (b) for each item, visually check the occurrence of wrinkles, and record the situation that covers the entire surface of the stick as 100%. It was expressed as an average value.

The test piece in the previous section was subjected to (A) fumigation treatment, (B) boiled oil, (C) bamboo vinegar, (D) boric acid, immersion treatment in each liquid, and degreasing treatment with alkali (E) to conduct a fouling test It was.
(A) Fumigation treatment: A test piece was hung on the upper part of a 50cm square 70cm high fumigation chamber, an aluminum plate with a heater was placed on the lower part, and a fumigation chip was placed on it to generate smoke. The smoke temperature near the specimen is kept at 40-60 ° C. Fumigation time Aa, 45 minutes: Ab, 90 minutes: Ac, 180 minutes:
(B) Soaking oil soaking treatment: 140cc of Kashiwa product "Kashiwasui" was added to 2cc of Yoshikawa Hayashi Kogyo Co., Ltd. and a small amount of soap solution was added and thoroughly mixed 140cc. A bamboo specimen was immersed in this solution at room temperature and pressure for about 30 hours. The test piece was divided into two, and Ba was subjected to fumigation for 90 minutes after air drying.
(C) Bamboo vinegar immersion treatment: Water was added to 80 cc bamboo vinegar solution of Tachibana Bamboo Co., Ltd. to 250 cc. The test piece was immersed in this solution under the same conditions as B, and Cb was fumigated for 90 minutes as it was.
(D) Caustic soda degreasing treatment: A test piece was immersed in a 5% caustic soda solution, heated and boiled for 3 minutes, and then washed with water. Da as it is, Db fumigation for 90 minutes (E) Boric acid solution immersion treatment; 16.5 grams of pharmacopoeia boric acid powder was dissolved in 300 cc of warm water with good stirring to dissolve it to give a solution of about 5%. The test piece was immersed in this under the same conditions as B.
As it was, Da was fumigated for 90 minutes.

The specimens immersed in each of the preceding paragraphs are air-dried well, and the blank specimen is immersed in water for about 30 hours.
After soaking, it was air-dried to make Bl bamboo and Bl Higo.
On the other hand, two 10cm diameter dishes are placed on the inside lower part of a foamed polystyrene container that is 47cm in length and 35cm in width and 23cm in depth, and water is always replenished to a depth of about 5mm to maintain water vapor saturation.
Two sets of two horizontal bars with an interval of 12 cm were placed on the inner upper part of the box, and the test pieces described in detail in this example were arranged on the upper part in a random manner so as to avoid mutual contact.
The upper part of the box was lightly covered with newspaper so as not to obstruct the air flow to the outside, and the lid was fixed with an appropriate weight.
The entire box was left outside the environment to prevent rain dew, and the occurrence of drought was monitored.

The above table shows the results of starting the drought generation experiment on September 22 and continuing the experiment until May of the following year.
・ Bl blank bamboo broken specimens had black spots of black cocoon early, but the commercially available bamboo chin was pre-treated, so the generation of cocoons was slow and progressed slowly.
・ Fumigation treatment is not effective in about 45 minutes and needs 90 minutes or more, but 100% effect cannot be expected.
・ Bamboo vinegar, which is slightly effective with fumigation oil but not effective with fumigation treatment, is quite effective.
・ As the degreased material is treated with alkali, the color peculiar to bamboo is also decolored.
・ Boric acid showed the best results in this experiment. Panels manufactured using such bamboo as a binding material are usually used shortly after manufacturing when used as building materials, but they are expected to contribute to control not only moths but also insect damage such as insect worms after construction. it can.

<Example 2>
In this experiment, Miso bamboo harvested one year ago was cut into 15cm lengths and vertically cut into 24 pieces as test pieces.
This time, boric acid and sodium chloride, which showed good results in Example 1, were compared. The salt used was almost pure JT salt and Kyushu salt containing bitter juice, which is recently called natural natural salt.
We used a foamed polystyrene box that had been cultured in the previous experiment.
The season is also from the end of May, and it is the best season for culturing sputum.

15 grams each of JT salt, Kyushu salt, and boric acid were dissolved in 300 cc of water or warm water to make a 5% aqueous solution, and these were designated as A, B, and C. D and E were obtained by adding 3 grams of JT salt and 3 grams of Kyushu salt to 15 grams of boric acid and dissolving in 300 cc of hot water. Separately, 300 cc of tap water was put in a polyethylene container to make Bl.
Each of the bamboo specimens prepared in the previous section was placed in a Bl, A, B, C, D, or E container containing these solutions.
Fill 5-6 pieces and let them soak and penetrate for 25 hours. Then lightly wash with water and air dry for 3 days.
These test pieces were allowed to stand so as not to contact each other on the bars of the polystellene box detailed in paragraph 0017, and the wrinkle generation test was started on May 20.


The above table is a record of about 4 months after the May 20th drought test started. Compared to the previous test, the overall occurrence of wrinkles is faster. This is because the polysterylene box used in the previous test was used without being disinfected, it was a time / environment where wrinkles were likely to occur, 1 It seems that there was a difference due to the use of old bamboo.
・ In the test, the appearance of spots of the cocoon colonies appearing on the surface of the bamboo specimen was visually observed and indicated in%. The wrinkles that were first observed through all tests were black mold and the colonies were observed as black spots. The observation value of each of 5 to 6 test pieces was expressed as a simple average.
・ The impregnation of salt itself is not much different from the blank, and in some cases promotes the generation of wrinkles.
・ The test piece immersed in 5% boric acid water generates wrinkles later than the blank and salt immersed pieces.
・ Adding 1% salt, especially pure JT salt, to 5% boric acid water seems to increase the deterrent effect.

<Example 3>
Untreated bamboo wings with a diameter of 5 mm and a length of 80 cm were prepared.
A, blank
B, Heat 2 liters of water to a slightly warm water of about 40 ° C, add 100 g of boric acid and stir well. Dissolved.
C, 110 g of boric acid was added to 200 cc of methyl alcohol in advance, and the semi-dissolved solution was added to 2 l of warm water to completely dissolve it.
To the solution prepared in the same manner as D and C, 60 g of bamboo vinegar manufactured by Ito Ryokuchi Construction Industry was added and mixed well.
Each of these four types of liquid is poured into a 2-inch diameter vinyl tube with the bottom closed, and 20 chins are soaked and left at room temperature. After about 50 hours, the chin is taken out and air-dried indoors.
These chins are placed in the polystyrene soot box detailed in paragraph 0017, and the state of soot is observed.

Discussion ・ In the case of Bamboo Higo, unlike Hsinchu, the effect of boric acid treatment was demonstrated clearly.
・ The experimental period was exactly the hot and humid season of the rainy season, and it was very early because of the presence of a piece of bamboo that was being tested last time next to the box.
・ In the case of no treatment, the entire chin was boiled and half-black on the fifth day of the test, and it was not worth using. At this time, there is no significant change in the processed product ABC.
・ After 22 days, there was a sign of the processed product.
・ After 1 month or more, the occurrence of wrinkles became clear, but it was less than 1/3 of the blank.
・ Although two and a half months have passed, the trend has not changed, and the rate of soot has slowed but increased slightly.
-B seems to help the dissolution of boric acid into the bamboo fiber structure by first dissolving boric acid in methyl alcohol with strong dissolving power and diluting it with water.
・ In C, bamboo vinegar was added to this, but the effect of suppressing wrinkle generation was clearly seen, which is thought to be due to the penetration effect of methyl alcohol. The antibacterial components of bamboo are said to be 2,6 dimethoxy / 1,4 benzoquinone and tannin.
・ Commercially available bamboo vinegar is said to contain many minor components such as solids concentration of about 10%, specific gravity of 1.011, PH2-4, acetic acid of about 4%, tar, propionic acids, alcohols, furan.
Such natural products containing tar and acetic acid have wood vinegar obtained by dry distillation of wood components, and the same effect can be expected.
The amount of bamboo vinegar added in this experiment corresponds to the addition of 2% acetic acid per boric acid in C in this example.
・ The experiment was conducted in the form of leaving the test box for soot generation under natural conditions.
In other words, it is highly dependent on temperature and humidity, and is intended for comparative tests within one experiment.

The drawing shows the situation of the test piece immediately after the start of the wrinkle generation test of Example 4 and five days later with a photograph and a sketch. In the figure, blank is unmarked, A is one horizontal bar, B is two horizontal bars, and C is three horizontal bars.
Fouling test result sketch 4 sections of 5mm width in the sketch each represent the surface of bamboo chin, from the left, Bl (blank), samples C, B, and A. The occurrence of wrinkles is represented by small black dots, and the larger the number, the more the wrinkles are generated. Same as above

Claims (3)

    A bamboo antifungal agent obtained by adding bamboo vinegar or wood vinegar containing acetic acid to an aqueous solution containing boric acid.     2. The bamboo antifungal agent according to claim 1, wherein methyl alcohol is added to the antifungal agent. An antifungal method in which the antifungal agent according to claim 1 or 2 is applied or infiltrated.