JPH0523163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a wood preservative and insect repellent treatment method and treatment agent. More specifically, the present invention relates to a treatment method and a treatment agent for preservative and insect repellent treatment of wood by injecting it into wood using a pressure injection method. (b) Prior Art A method of injecting a preservative and insect repellent into wood is known as a preservative and insect repellent treatment for wood, and specific methods include pressure injection, dipping, and coating. Among these methods, the pressurized injection method involves placing the wood in a pressurized metal (iron, steel) wood processing tank and introducing the chemical solution under reduced pressure from a chemical storage/recovery tank connected to the tank via piping. After soaking the wood, the chemical solution is applied to the inside of the wood by applying pressure, and the remaining chemical solution is stored in a chemical storage/recovery tank for reuse. This is the best way to apply an aqueous solution of a preservative and insect repellent. The chemical solution to be injected into the above-mentioned wood pressure injection treatment system is a one-part aqueous solution of so-called CCA (a wood preservative containing a mixture of chromium compounds, copper compounds, and arsenic compounds), which has been conventionally used in terms of antiseptic and insect repellent effects. It is used as a treatment agent. Such CCA
This treatment method using chemical solutions does not cause corrosion of metal wood treatment tanks, chemical storage/recovery tanks, and their connecting piping, is less likely to cause chemical precipitation, and can withstand repeated use over long periods of time. It is. On the other hand, quaternary ammonium salts have recently been recognized as effective as wood preservatives.
A proposal has also been made to perform pressurized injection using this aqueous solution as a treatment liquid (Japanese Patent Application Laid-open No. 188607/1983). (c) Problems to be solved by the invention However, in the former method using CCA, there is a problem with the toxicity of the wood after the injection treatment.For example, when the wood is incinerated, highly toxic arsenite gas and There is a pollution problem in that hexavalent chromium ash is scattered. Therefore, there is a strong need for a pressurized injection treatment method that uses a substantially harmless chemical solution that can replace CCA. On the other hand, the latter method using quaternary ammonium salts has lower toxicity than CCA, but it has virtually no insect repellent effect and requires further injection treatment with an insect repellent solution. The disadvantage is that it is not possible to perform antiseptic and insect repellent treatment in one injection treatment. Furthermore, the aqueous solution has insufficient stability and cannot withstand repeated treatments over a long period of time, and is highly corrosive to wood treatment tanks, chemical storage/recovery tanks, piping, etc., making it impossible to put it into practical use. . This invention was made to solve these problems, and in particular, it is possible to impart intended antiseptic and insect repellent properties to wood with a single pressurized injection treatment, and it also prevents corrosiveness to tanks, piping, etc. The object of the present invention is to provide a method for wood rot and insect repellent treatment that can significantly improve the process, eliminate toxicity, and allow repeated treatments over a long period of time. (d) Means and action for solving the problems From the above viewpoint, the present inventors first focused on the low toxicity of quaternary ammonium salts, and added boric acids, which are low toxicity insect repellent (termite repellent) ingredients. We came up with the idea of performing pressurized injection using a monocomponent drug solution that combines the following. However, simply using these in combination cannot prevent corrosion of tanks, piping, etc. In this regard, it is also conceivable to further use an anticorrosion component. However, simply adding a general-purpose anticorrosive agent improves the corrosion resistance, but the stability of the chemical solution is insufficient and it cannot withstand repeated use (see Comparative Examples below). As a result of further intensive research and consideration on various combinations of anticorrosion components to be added, the present inventors have determined that a specific ratio of a water-soluble alkanolamine compound and a zinc ion supplying compound as anticorrosion components can be used to achieve the above-mentioned antiseptic and insect repellent properties. The inventors have now completed this invention by discovering the fact that when used in combination with other ingredients, the stability of the treatment solution (chemical solution) is not inhibited but rather improved, and moreover, an excellent synergistic anti-corrosion effect can be achieved. Thus, according to the present invention, (a) a quaternary ammonium salt compound, (b) a boric acid compound, (c) a water-soluble alkanolamine compound, and (d) a zinc ion supplying compound (a):(b) :(c):(d) as 1:0.25～4:0.01～
Weight ratio of 0.5:0.005 to 0.04 [However, (c) is the value converted to nitrogen content, and (d) is the value converted to zinc ion content. ]
A wood pressurization system consisting of a tank capable of pressurizing an aqueous solution containing 0.5 to 4% by weight of component (a) for wood treatment, a tank for storage and recovery of chemical solutions, and a pipe connecting these. Provided is a method for preservative and insect repellent treatment of wood, which comprises introducing the agent into a treatment system and injecting it under pressure into wood while preventing corrosion within the treatment system. One of the characteristics of this invention is that the above-mentioned components (a) and (b) are employed as antiseptic and insect repellent components in order to use a low-toxicity one-component treatment solution.
Other features of this invention include the above component (a) and
In addition to (b), ingredients (c) and (d) are added in a specific ratio as anti-corrosion ingredients.
It is a combination of. Component (c) or (d) alone as component (a)
It is difficult to obtain both the stability of the treatment agent and the excellent anticorrosion properties even when combined with (b) or other known anticorrosion components. Therefore, such a combination can be said to have been selected. The above component (a) used in this invention is the following formula () or (): ₍ In the formula, R ₁ is a C _8-20 alkyl group or alkenyl group, R ₂ and R ₃ are a C _1-5 alkyl group, a _{C 1-5 hydroxyalkyl} group or an aralkyl group, and R ₄ is a methyl _group . , _{a C8-20} alkyl group or alkenyl group,
_R5 represents _{a C8-20} alkyl group or alkenyl group, and X represents a halogen atom. ), and more specifically, the cation moiety includes lauryldimethylbenzylammonium, myristyldimethylbenzylammoniums, lauryltrimethylammonium, myristyltrimethylammonium,
Monoalkyltrimethylammoniums such as cetyltrimethylammonium and stearyltrimethylammonium, dialkyldimethylammoniums such as didecyldimethylammonium and distearyldimethylammonium, and alkyldimethyldroxyethylammonium such as lauryldimethylhydroxyethylammonium and myristyldimethylhydroxyethylammonium. Examples of the anion moiety include chlorine, bromine, and iodine. Among these, lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, didecyldimethylammonium chloride, or lauryldimethylbenzylammonium chloride is preferably used from the viewpoint of antiseptic effect. Component (b) used in this invention includes boric acid compounds such as boric acid (orthoboric acid), metaboric acid, tetraboric acid, and haboric acid, and their alkali metal salts, and alkaline metal salts such as sodium salts. If a metal salt is used, the aqueous solution becomes strongly alkaline and causes discoloration of the wood, so a boric acid compound that is not an alkali metal salt is preferred. The component (c) used in this invention includes 1 to 10 carbon atoms.
Water-soluble alkanolamines are suitable, and specifically compounds represented by the following formulas () to () are suitable. R ₂ NR′OH ……() RN(R′OH) ₂ ……() N(R′OH) ₃ ……() H ₂ NR″NHR′OH ……() HOCH ₂ NHR′OH ……( ) H ₂ NR'OR ...() Here, R is a hydrogen atom or a lower alkyl group,
R′ is a lower alkylene group, R″ is a lower alkylene group,
Each R represents a lower alkyl group. R and R
The lower alkyl group has a carbon number (hereinafter referred to as C) 1
-4 alkyl group, the lower alkylene group for R' is preferably a C2-3 alkylene group, and the lower alkylene group for R'' is preferably a C1-4 alkylene group. Specific examples of these include monoethanol Amine, monopropanolamine, N
-Methylethanolamine, N-ethylethanolamine, N-propylethanolamine, N-
Butylethanolamine, N-methylpropanolamine, N-ethylpropanolamine, N-
Propylpropanolamine, N-butylpropanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, N,N
-dipropylethanolamine, N,N-dibutylethanolamine, N,N-dimethylpropanolamine, N,N-diethylpropanolamine, N,N-dipropylpropanolamine,
N,N-dibutylpropanolamine, diethanolamine, dipropanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, N-propyldiethanolamine, N-butyldiethanolamine, N-methyldipropanolamine, N-ethyldipropanolamine,
N-propyldipropanolamine, N-butyldipropanolamine, triethanolamine,
Tripropanolamine, 2-aminomethylethanolamine, 2-aminoethylethanolamine, 2-aminopropylethanolamine, 2-
Aminobutylethanolamine, 2-aminomethylpropanolamine, 2-aminoethylpropanolamine, 2-aminopropylpropanolamine, 2-aminobutylpropanolamine,
Examples include 2-hydroxymethylethanolamine, 2-hydroxymethylpropanolamine, methoxyethylamine, ethoxyethylamine, propoxyethylamine, butoxyethylamine, methoxypropylamine, ethoxypropylamine, propyoxypropylamine, butoxypropylamine. Among these, monoethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine or N-
- It is preferable to use ethyldiethanolamine from the viewpoint of anti-corrosion properties. As component (d) used in this invention, it is suitable to use a water-soluble zinc salt, such as zinc chloride, zinc sulfate, zinc acetate, zinc gluconate, and the like. Among these, it is preferable to use zinc sulfate or zinc gluconate from the viewpoint of stability of the treatment liquid. An aqueous solution (processing liquid) used in the present invention can be obtained by dissolving each of the above components in water. However, this solution may optionally contain a hydrophilic organic solvent. The addition ratio of each of the above-mentioned components (a), (b), (c) and (d) to be dissolved is such that component (a) is 1 and (b) is 0.25 to 0.25 by weight.
4. Adjust so that (c) is 0.01 to 0.5 and (d) is 0.005 to 0.04. [However, (c) is the value converted to nitrogen content, and (d) is the value converted to zinc ion content] Among these, (a)
The ratio of (b) and (b) is determined based on the balance between antiseptic and insect repellent properties. On the other hand, if component (c) is less than 0.01 or component (d) is less than 0.005 when component (a) is 1, the corrosion inhibiting effect will be insufficient at a practical concentration and it will not be suitable. Also, if component (c) exceeds 0.5 or component (d)
If it exceeds 0.04, the corrosion inhibiting effect will not increase commensurately with the increase in amount, making it economically unacceptable, and component (d) tends to precipitate inert zinc salts under practical concentrations, making it unsuitable. The preferred addition ratio of these is 0.25 to 4:0.01 to 1 for component (a) and (b):(c):(d).
0.3: 0.01 to 0.035 (weight ratio) [However, (c) is the value converted to nitrogen content, and (d) is the value converted to zinc ion content. ]
It is. The concentration of each of these components in the treatment solution depends on the type and use of the wood to be treated with antiseptic and insect repellent treatment, but it is usually so that at least 2 kg of the above component (a) is impregnated per 1 m ³ of wood. From this point of view, it is suitable to adjust the amount of component (a) in the processing liquid at 0.5 to 4% by weight.
It is appropriate to set it so that Concentrations of other components are appropriately determined based on the above ratios. Regarding the depressurization conditions and pressurization conditions of the tank for pressurized injection and the process, conventional conditions can be applied as they are. A solution obtained by dissolving the above components (a), (b), (c) and (d) in an aqueous solvent is useful as a wood preservative and insect repellent for direct pressure injection under the above concentration, and also has the above-mentioned properties. Even if the concentration exceeds the concentration, it is useful as a wood preservative and insect repellent that can be diluted to a predetermined concentration when injected under pressure. In particular, since it contains each of the above components, the stability of the formulation is significantly improved.For example, even when orthoboric acid, which normally has a solubility of about 4% by weight, is used as component (b), the stability of the formulation is significantly improved. It can be stably dissolved at a high concentration of 5 to 50% by weight, and as a whole it is possible to formulate a preparation with a higher concentration than conventional ones, which is advantageous in terms of transportation and storage. Therefore, this invention provides (a): (b) a quaternary ammonium salt compound, (b) a boric acid compound, (c) a water-soluble alkanolamine compound, and (d) a zinc ion supplying compound. :(c):(d) as 1:0.25～4:0.01～
Weight ratio of 0.5:0.005 to 0.04 [However, (c) is the value converted to nitrogen content, and (d) is the value converted to zinc ion content. ]
The present invention also provides a wood preservative and insect repellent which is dissolved in an aqueous solvent. It should be noted that other additives such as antifoaming agents may be added to the processing liquid and processing agent used in the method of the present invention, as long as they do not impede their effects. According to the method of this invention, the low toxicity component (a) and
The presence of (b) allows the preservative and insect repellent treatment to be carried out in a single pressurized injection treatment without inducing toxicity problems. Further, due to the presence of the low toxicity components (c) and (d), an excellent anticorrosion effect is exhibited without impairing the stability of the treatment solution, and corrosion of the wood pressure injection treatment system is prevented. (e) Example Test Example 1 [Formulation stability and corrosion inhibiting ability of wood preservative and insect repellent composition as a treatment liquid suitable for pressure injection method] Examples of the present invention as a treatment liquid suitable for pressure injection method A wood preservative insect repellent and a comparative example wood preservative insect repellent were prepared, and their formulation stability and corrosion inhibiting ability were tested. The results are shown in Table 1. The test method and the meanings of the symbols in Table 1 are as follows. ○…

Claims (1)

[Claims] 1 (a) a quaternary ammonium salt compound, (b) a boric acid compound, (c) a water-soluble alkanolamine compound, and (d) a zinc ion supplying compound (a): (b) :(c):(d) as 1:0.25～4:0.01～
Weight ratio of 0.5:0.005 to 0.04 [However, (c) is the value converted to nitrogen content, and (d) is the value converted to zinc ion content. ]
A wood pressurization system consisting of a tank capable of pressurizing an aqueous solution containing 0.5 to 4% by weight of component (a) for wood treatment, a tank for storage and recovery of chemical solutions, and a pipe connecting these. 1. A method for preservative and insect repellent treatment of wood, which comprises introducing the process into a treatment system and injecting the wood under pressure while preventing corrosion within the treatment system. 2 (a) Quaternary ammonium salt compound, (b) boric acid compound, (c) water-soluble alkanolamine compound, and (d) zinc ion supplying compound (a):(b):(c):( d) as 1:0.25~4:0.01~
Weight ratio of 0.5:0.005 to 0.04 [However, (c) is the value converted to nitrogen content, and (d) is the value converted to zinc ion content. ]
A wood preservative and insect repellent that is dissolved in an aqueous solvent.