JP2000043008A - Wood antiseptic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alkyl ammonium salt type wood antiseptic in which the corrosion of iron materials is restrained. SOLUTION: A wood antiseptic containing an alkyl ammonium salt as a main agent is incorporated with one or more kinds of heterocyclic alkyl ammonium salts selected from the group consisting of alkyl pyridinium salts, alkyl quinolinium salts, and alkyl isoquinolinium salts. Preferably, the heterocyclic alkyl ammonium salt has 8-18C alkyl group and the alkyl ammonium salt as the main agent is didecyl dimethyl ammonium chloride.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an alkylammonium salt type wood preservative composition having reduced metal corrosivity.

[0002]

2. Description of the Prior Art Alkyl ammonium salt type wood preservatives are widely used in wood preservative processing, and a typical example thereof is didecyldimethylammonium chloride (sometimes abbreviated as DDAC). In recent years, the use amount of DDAC has been increasing. However, when DDAC is used as an aqueous solution for preservative treatment, it is generally prepared as a 1 to 2% aqueous solution, and impregnated into wood by pressure injection, immersion, or the like.

[0003] This DDAC exhibits strong corrosiveness to iron materials, and there is a concern that the DDAC aqueous solution at a practical concentration will corrode the iron materials of the preservative treatment apparatus severely. As a countermeasure against the corrosion of the DDAC aqueous solution, it is effective to improve the quality of the metal material. However, there are many cases in which a conventional iron device is used without taking specific anticorrosion measures. From the viewpoint of economic efficiency, it is often necessary to use a conventional iron-made device for a treatment device such as pressure injection or immersion impregnation of a chemical, and prompt measures for corrosion are required.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an alkylammonium salt type wood preservative which suppresses corrosion of iron materials.

[0005]

That is, the present invention relates to a wood preservative containing an alkylammonium salt as a main component, which is selected from the group consisting of an alkyl-pyridinium salt, an alkyl-quinolinium salt and an alkyl-isoquinolinium salt. A wood preservative containing two or more heterocyclic alkylammonium salts. The heterocyclic alkylammonium salt preferably has an alkyl group having 8 to 18 carbon atoms, and the alkylammonium salt compound as the main agent is preferably DDAC.

The wood preservative of the present invention can be used as an anticorrosion agent in a heterocyclic alkylammonium salt (HA) in an aqueous solution of an alkylammonium salt having a practical concentration, preferably an aqueous DDAC solution.
A (may be abbreviated as A). Also, H
AA can be combined with a conventionally known anticorrosive for water, for example, sodium carbonate, sodium nitrite, and the like.

The HAA is obtained by reacting a heterocyclic base such as pyridine, quinoline and isoquinoline with an alkyl halide having 8 to 18 carbon atoms, preferably an alkyl halide having 10 to 16 carbon atoms. The halogen in the alkyl halide may be any, but chlorine is preferred from the viewpoint of economy.

The amount of HAA in the wood preservative of the present invention varies depending on the type of heterocyclic base such as pyridine, but is generally 5 to 10 parts by weight based on 100 parts by weight of DDAC.
0 parts by weight, preferably 10 to 40 parts by weight. Also,
The DDAC aqueous solution may have a practical concentration of about 1 to 2%.

Since the solubility of HAA in water varies depending on the type of bases and the length of the alkyl group, the solubility may be selected so as to be within the above range. Note that H
AA is known to be effective also as a wood preservative (Japanese Patent Application Laid-Open No. 5-310511).
There is no problem if it is blended with the C aqueous solution.

Inorganic salts known as anticorrosives for water are replaced with HAA
When it is blended in combination with, corrosion to the iron material is further reduced. In particular, when sodium nitrite or the like having relatively low solubility in a DDAC aqueous solution is used, HAA
Also functions as a dissolution aid, so that the aqueous solution does not become cloudy. Inorganic salts are 5 to 30 parts per 100 parts by weight of DDAC.
What is necessary is just to mix | blend about a weight part. When inorganic salts are added, the pH of the aqueous solution increases, but on the alkaline side, D
Since preservative components such as DAC become chemically unstable, it is necessary to neutralize to a neutral region with sodium hydrogen phosphate and other weak acids.

When the above anticorrosive is mixed with the DDAC aqueous solution, a known general stirring and dissolving may be performed, and no special equipment, temperature and other conditions are required.

Although the cause of DDAC corrosion is not clear, it is considered that the anticorrosion effect of the present invention exerts the anticorrosion effect by adsorbing HAA on the metal surface and blocking it from corrosive components.

[0013]

The present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples. In Examples, “parts” indicates “parts by weight” and “%” indicates “% by weight”.

Examples 1 to 3 and Comparative Example 1 An aqueous solution prepared by dissolving the amount of lauryl isoquinolinium chloride (LIQC) or lauryl quinolinium bromide (LQB) shown in Table 1 in a 1% distilled aqueous solution of DDAC. ,
Carbon steel (SS-400) was immersed at 20 ° C. for 24 hours. The specimen used was SS-400 (400 × 200 × 2t) polished by # 600. For comparison, an immersion test was similarly performed without blending either LIQC or LQB. Table 1 shows the results. In addition, the performance of each example as a wood preservative did not change.

Examples 4 to 6, Comparative Example 2 The amount of LIQC shown in Table 2 was added to a 1% tap water solution of DDAC.
Alternatively, LQB and sodium carbonate are dissolved, and p
H was adjusted to 7 with sodium dihydrogen phosphate. The same test piece as in Example 1 was used for this aqueous solution at 20 ° C. and 5 ° C.
An immersion test was performed over a period of days. For comparison, LIQC or L
An immersion test was similarly performed without blending any of QB.
Table 2 shows the results.

Examples 7 to 9 and Comparative Example 3 Table 3 was added to a tap water solution containing 1% of DDAC and 0.3% of LIQC.
Then, an immersion test was performed at 20 ° C. for 24 hours using the same test piece as in Example 1 by mixing 0.1% of the inorganic salt shown in (1). For comparison, an immersion test was similarly performed using only Na ₂ CO ₃ without LIQC. Table 3 shows the results.

Example 10, Comparative Examples 4 and 5 LIQC or 0.1% of an inorganic salt shown in Table 4 was mixed with a 1% DDAC aqueous solution, and the same test piece as in Example 1 was used. The immersion test was performed over time. In this immersion test, the pH was adjusted with a weak acid. Table 4 shows the results.

Examples 11 to 12 The amounts of cetylpyridinium chloride (CPC) and Na ₂ CO ₃ shown in Table 5 were dissolved in a 1% aqueous solution of DDAC in tap water, and an immersion test was carried out at 20 ° C. in the same manner as in Example 1. . Table 5 shows the results.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

[0022]

[Table 4]

[0023]

[Table 5]

[0024]

EFFECTS OF THE INVENTION The wood preservative of the present invention is much more corrosive to iron materials than those containing conventional anticorrosives, and can be used as an inexpensive iron equipment for processing equipment such as pressure injection and immersion impregnation of chemicals. Can be used.

Claims (3)

[Claims] 1. A wood preservative containing an alkylammonium salt as a main component, wherein one or more heterocyclic alkylammonium salts selected from the group consisting of alkyl-pyridinium salts, alkyl-quinolinium salts and alkyl-isoquinolinium salts are used. A wood preservative formulated. 2. The wood preservative according to claim 1, wherein the alkyl group of the heterocyclic alkylammonium salt is an alkyl group having 8 to 18 carbon atoms. 3. The wood preservative according to claim 1, wherein the alkylammonium salt compound as a main agent is didecyldimethylammonium chloride.