JP2517519B2 - Injectant for wood 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 pouring agent for treating wood, which has good permeability to wood, excellent dimensional stability of treated wood, low toxicity and easy handling.

[0002]

2. Description of the Related Art Conventionally, didecyldimethylammonium chloride (hereinafter referred to as DDAC as appropriate) has been used as an injection agent for wood treatment.
Abbreviated) and a zinc compound, those containing DDAC and polyethylene glycol having a molecular weight of about 1000, and those containing heavy metals such as chromium, arsenic or copper have been used.

Among these injectable components, DDA
C is excellent in antiseptic and ant-preventive effects, and it is known that the higher the content, the higher the effect. However, since it has toxicity, it is preferable to use a large amount from the viewpoint of safety in use. Moreover, it is not desirable to use a large amount from the viewpoint of manufacturing cost. Therefore, in order to utilize the antiseptic and ant-preventive effects of DDAC, it has been proposed and conventionally used in the form of a mixture with a zinc compound. On the other hand, DDA
A mixture of C and a zinc compound is not preferable from the viewpoint of maintaining safety, since the zinc compound shows toxicity even though it is low. Further, there is a drawback that the wood permeability is not good, a sufficient amount cannot be injected into the wood, and the processed wood cannot have sufficient dimensional stability. Therefore, in order to impart dimensional stability to the treated wood, it has been proposed and conventionally used to mix and use DDAC and polyethylene glycol to improve the permeability of the injection liquid into the wood.

[0004]

However, since the polyethylene glycol that can be used in this case has a molecular weight of about 1000 in the past, the usable polyethylene glycol is solid at room temperature, and it can be treated with wood. In order to use it for the purpose, it had to be dissolved in water before use, the handling was inconvenient, and the freezing temperature was not so low, and the effect of preventing cold cracking in the treated wood was not sufficient.

Separately from this, an antiseptic treatment liquid containing heavy metals such as chromium, arsenic and copper has been proposed, but in this case, since the heavy metals are toxic, they are discarded after use and are safe. There was a problem in use from the viewpoint.

The present invention has excellent antiseptic and termite-preventing effects on wood by improving the penetration into wood without impairing the antiseptic and termite effects of DDAC, and is dimensionally stable on treated wood. It is an object of the present invention to provide a pouring agent for treating wood, which is imparted with properties and further prevents freezing temperature of the wood by lowering the freezing temperature, has no toxicity itself, and is safe to handle.

[0007]

In order to solve the above problems, in the wood treatment injecting agent according to the present invention, glycols are contained in an amount of 10 to 30% by weight, a quaternary ammonium salt of 0.1 to 2% by weight, and It is composed of up to 0.5% by weight of an isothiazoline compound, and the balance water.

According to the present invention of claim 2, the glycols are those having 2 to 6 carbon atoms,
In the present invention according to claim 3, the quaternary ammonium salt is any one of didecyldimethylammonium chloride, didodecyldimethylammonium chloride, and alkyldimethylbenzyl chloride.
In the present invention of claim 4, the isothiazoline compound is constituted to be either chloromethylisothiazoline or methylisothiazoline.

[0009]

EXAMPLES Next, an example of the wood treatment injection agent according to the present invention will be described. The wood treatment injection agent according to the present invention is a treatment liquid that improves the dimensional stability of wood without impairing the antiseptic / termite effect and is highly safe.

The injecting agent for treating wood of this embodiment has 2 carbon atoms.
At least one quaternary ammonium salt selected from the group consisting of 10 to 30% by weight of glycols selected from low-molecular-weight glycols having 1 to 6, didecyldimethylammonium chloride, didodecyldimethylammonium chloride and alkyldimethylbenzyl chloride. 0.1 ~ 2
Wt% and at least one isothiazoline compound selected from chloromethylisothiazoline and methylisothiazoline 0.5 wt% or less, and the balance,
Composed of water. That is, for example, it comprises 10% by weight of ethylene glycol, 1% by weight of didecyldimethylammonium chloride, 0.5% by weight of chloromethylisothiazoline and water.

In the present invention, the low-molecular-weight glycols having 2 to 6 carbon atoms are excellent in wood permeability, and dissolve DDAC to penetrate wood deeply. The low molecular weight glycols are hygroscopic and the higher the concentration, the better the wood permeability of the injecting agent, but it is generally suitable to contain 10 to 30% by weight in the injecting solution. If it is less than 10% by weight, sufficient permeability cannot be obtained, and
This is because the penetrability is not improved so much even if the content is 30% by weight or more. Therefore, the above range is preferable also from the viewpoints of antiseptic, ant-preventing effect, dimensional stability and economical efficiency of wood. Examples of glycols having 2 to 6 carbon atoms include ethylene glycol, diethylene glycol and triethylene glycol.

On the other hand, in the present invention, DDAC, didodecyldimethylammonium chloride and alkyldimethylbenzyl chloride have antiseptic and antitermite effects,
When the content of these quaternary ammonium salts is high, their antiseptic and anti-termite effects are improved. However, since these quaternary ammonium salts are toxic, from the viewpoint of safety,
It is preferable that the above-mentioned range of 0.1 to 2% by weight is contained in the injection liquid before use. Each of these quaternary ammonium salts can be used alone or in a mixture.

In the present invention, the isothiazoline compounds of chloromethylisothiazoline and methylisothiazoline are used as a component for imparting antifungal and antiseptic effects to wood. The higher the content of these isothiazoline compounds, the better the fungicidal and antiseptic effects of the injectable solution, but it is preferable to use 0.5% by weight or less from the viewpoint of safety and manufacturing cost.

For the wood treatment injecting agent according to the present invention, the permeability, dimensional stability, freezing temperature measurement, antiseptic efficacy test, and termite efficacy test were conducted to show its specific performance.
Describe the results of the combustion test and acute toxicity measurement test.

Permeability measurement test Akita cedar having a width of 100 mm, a thickness of 100 mm and a length of 50 mm was used as a test body. As an injection agent, an injection solution (a) consisting of 15% by weight of diethylene glycol, 0.5% by weight of DDAC, 0.3% by weight of chloromethylisothiazoline and 84.2% by weight of water was prepared. For comparative tests, instead of diethylene glycol, polyethylene glycol 15 with a molecular weight of 1000 was used.
An injection liquid (b) having the same composition except that it contained wt% was prepared. The test bodies were subjected to pressure reduction and pressure treatment with the injection solutions (a) and (b), respectively. The treatment experiment was performed on five test bodies. The results are shown in Table 1 below.

[0016]

[Table 1]

From the above results, it is understood that the injection agent (a) has a larger injection amount than the injection agent (b), and that the injection agent (a) has better permeability to wood.

Dimensional Stability Test Specimen : Wood that had been infused in the permeability test was used. Test method : Heat-dried at 60 ° C. to compare the degree of shrinkage. The test was performed on five test bodies, and the average value was taken. The results are shown in Table 2 below.

[0019]

[Table 2]

[0020] Table 3 shows the freezing temperature measurements freezing temperature measurements.

[0021]

[Table 3]

From the above results, in the injectable composition of the present invention, the use of low-molecular-weight diethylene glycol improves the penetrability into wood and allows the preservative-treating agent to penetrate into the interior of the wood and It was confirmed that it improves the antiseptic and ant-preventive effects and also improves the dimensional stability of the treated wood. Further, in the injection agent of the present invention, the freezing temperature is lowered as compared with the conventional polyethylene glycol, so that the storage of the treatment liquid and the treatment work can be facilitated, and the cold cracking of the wood can be prevented.

Antiseptic test Akita cedar treated with the injecting agent for wood treatment of the present invention and untreated Akita cedar were subjected to an antiseptic efficacy test according to JIS A 9302, and the antiseptic efficacy was measured. As test bacteria, Pleurotus cornucopiae and Pleurotus cornucopiae were used. The dimensions of the specimen were 20 x 20 x 10 mm. The results are shown in Table 4 below.
Shown in

[0024]

[Table 4]

From the above results, it was confirmed that the wood treatment injection material of the present invention has a remarkable antiseptic effect.

Ant-term efficacy test The termite-term efficacy test was carried out on the wood treatment injection material of the present invention. The ant control efficacy test was conducted according to the JTCAS No. 1B HA test, and the average weight loss rate and mortality rate were determined. As a correction test, we conducted a similar experiment without adding ants,
The test result was corrected according to the following formula. Corrected average weight loss rate (%) = Average weight loss rate of test body (%)-Average weight loss rate of corrected test (%) The results are shown in Table 5 below.

[0027]

[Table 5]

From the above results, the red pine treated with the injecting agent for wood treatment of the present invention has a mortality of 100%, and the injecting agent for preservative treatment of the present invention is very effective in terms of the termite control effect of injected wood. It was confirmed to be excellent.

Combustion test The chlorine gas concentration generated when wood chips injected with the wood treatment injection agent of the present invention were burned was measured. As a result, the chlorine gas concentration generated was less than 6 ppm in all cases, which was sufficient to satisfy the handling safety standard.

Acute toxicity test The toxicity of the injectable agent for wood treatment of the present invention to fish was measured by an acute toxicity test using Japanese killifish. The measurement is JI
It carried out according to S K0102 74. The results are shown in Table 5 below.

[0031]

[Table 6]

From the above results, the LC50 after 96 hours was 636-
Since it was 1085 ppm, it became clear that the injection agent for wood treatment of the present invention has weak acute toxicity as compared with many pesticides and heavy metals.

[0033]

As described above, in the wood treatment injecting agent of the present invention, the use of low-molecular-weight glycols having a carbon number of 26 in place of the conventional polyethylene glycol makes it possible to improve the wood permeability. Therefore, it is effective in improving the antiseptic and ant-preventing effects of the treated wood and improving the dimensional stability of the treated wood. In addition, low-molecular-weight glycols easily dissolve water-soluble substances, thus improving the liquid stability of the injectable agent and preserving it together with the above-mentioned permeability.
It also has the effect of introducing the termite control agent to deep wood. further,
The addition of low-molecular-weight glycols lowers the freezing temperature of the infusate, which makes it possible to prevent cold cracking in treated wood. In addition, since the injection agent of the present invention contains chlorine but does not contain heavy metals, it has low toxicity, and has effects of being safe and easy to install and dispose.

Claims (4)

(57) [Claims] 1. A glycol of 10 to 30% by weight, a quaternary ammonium salt of 0.1 to 2% by weight, and an isothiazoline compound.
An injecting agent for wood treatment, which contains 0.5% by weight or less and the rest of water. 2. The injection agent for treating wood according to claim 1, wherein the glycol is a glycol having 2 to 6 carbon atoms. 3. The wood treatment according to claim 1, wherein the quaternary ammonium salt is any one of didecyldimethylammonium chloride, didodecyldimethylammonium chloride, and alkyldimethylbenzyl chloride. For injection. 4. The wood treatment injection agent according to claim 1, wherein the isothiazoline compound is any one of chloromethylisothiazoline and methylisothiazoline.