NO128563B - - Google Patents

Abstract

1326937 Wood preservatives containing pentachlorophenol salts NORDDEUTSCHE AFFINERIE and C F SPIESS & SOHN 24 Sept 1970 [24 Sept 1969] 45655/70 Heading ASE A wood preservative comprises a solution in an organic solvent of a salt of pentachlorophenol with ethylene diamine, diethylene tri-- amine or hexamethylene tetramine, the organic solvent being a monohydric or polyhydric alcohol, a ketone, a methylated naphthalene and/or a mineral oil containing aromatics. Optional ingredients are wetting agents, fungicides and/or insecticides, e.g. chloronaphthalenes, #- naphthol, nitrophenols, tar oil distillates, creosote, tri-n-butyl tin oxide, DDT, γ-hexachlorocyclohexane and diethyl p-nitro-phenyl thiophosphate.

Description

Wood preservative.

The invention relates to a wood preservative containing

alkylamine salts of pentachlorophenol.

Generally -it is -necessary to protect wood, especially building

wood and wood materials for insect and fungal attack, as it can otherwise

three high losses. Among the destructive fungi, above all house-

the mushroom (Merulius lacrimans), further cellar mushroom (Coniophora cercebella)

- and the pore fungus (Poria vaporiara) causes economically significant damage to unprotected wood. The same applies with regard to wood-destroying insects. of which the larvae of the house weevil (Hylotrupes bajulus), various types of anobies, and sometimes wood ants are notorious.

For a long time, chemical compounds have been used as protective substances against such destruction, including, for example, metal fluorides, silicofluorides, arsenic, mercury, boron compounds and copper and chromium salts. Among the organic compounds, chlorine derivatives of naphthalene, various insecticides and organotin compounds have been known (Zinn und seine Verwendung Nr. 57 (1963), pages 10-12, no. 64 (1964), pages 5-10, no. 70 ( 1966), pages 3-5.

In recent years, pentachlorophenol and its water-soluble metal or ammonium alters have particularly emerged (DAS 1 019 816, 1 021 158, 1 136 093 and 1 277 548). Pentachlorophenol is one of the most effective wood preservatives, decisive disadvantages include, however, the difficult handling of the known strongly corrosive compounds, the corrosive properties and the low fixing ability on wood fibers, thereby reducing the duration of the protection and causing a persistent, unpleasant odor, evaporation of pentachlorophenol, above all at higher temperatures. Instead of the pentachlorophenol compounds used for the most part in an organic solvent after one of the usual ironing, dipping or impregnation methods, the water-soluble salts have also been used which, however, have the disadvantage of leachability. All attempts to offset this disadvantage by subsequent treatment with carbon dioxide, "fixing" heavy metal salt solutions, etc., are for practice too cumbersome and too complicated for bulk goods.

The monoamine salts of pentachlorophenol mentioned in US patent no. 2,650,892 are also water-soluble and have a small fixation in the wood body. Penetration in wood is unsatisfactory.

It was now found that the known disadvantages can be avoided when a wood preservative containing alkylamine salts of pentachlorophenol is used which, according to the invention, is characterized in that it contains a solution of one or more of the salts of pentachlorophenol with ethylenediamine, diethylenetriamine and hexamethylenetetramine in an organic solvent.

The crystalline salts that can be easily prepared from pentachlorophenol and the above-mentioned amines mostly show a moderate to low solubility in water and are largely soluble in the usual organic solvents. As is known, their production takes place by reaction between molar amounts of the acidic and basic components. The amine salts of the wood preservative according to the invention have a very low vapor pressure, so that it does not evaporate on impregnated wood. They are non-corrosive, non-corrosive and have a surprisingly strong adhesive effect on wood fibers.

The melting point of the amine salt amounts to:

ethylenediamine approx. 235°C during decomposition diethylenetriamine approx. 230°C during decomposition hexamethylenetetramine approx. 230°C during splitting The application of wood preservatives according to bpp;fitohe:ls-"e'nf ss t a takes place preferably by dipping, moistening, bestr<y>khin<g>. edlérsbés.<p>rø<y>t-mng of the wood to be protected in, respectively, with solutions of the amine salts of pentachlorophenol in organic solvents.As such, monohydric or polyhydric alcohols, ketones, methylated naphthalenes and/or mineral oils with an aromatic component are suitable.

The wood preservative according to the invention can also contain in and of itself known1 fungicides and/or insecticides such as 1-chloronaphthalene, 2-chloronaphthalene, 1,2-dichloronaphthalene, 2,6-dichloronaphthalene, beta-naphthol, nitrophenols, tar oil distillates, creosote oil, tri- n-butyl-tin oxide, dichloro-diphenyl-trichloroethane, gamma-hexachloro-cyclohexane, diethyl-p-nitrophenyl-thiophos fat. Additions of wetting agents can facilitate penetration into the wood. The addition of emulsifiers is appropriate when aqueous dispersions are to be prepared from emulsifiable concentrated solutions.

The following examples illustrate the wood preservative according to the invention.

Example 1

In a solvent mixture of one part ethylene glycol and one part methylcellosolve (2-methoxyethanol), 20 percent by weight of the ethylene diamine salt of pentachlorophenol is dissolved. The solution provides, in the dipping or spraying method, applied in a quantity of 10 - 20 g/m wooden surface, a leach-resistant protection of wood against fungal and insect attacks.

The wood treated with the example's solution has a leach-resistant protection against fungal and insect attacks.

Claims (2)

1. Wood preservative containing alkylamine salts of pentachlorophenol, characterized in that it contains a solution of one or more of the salts of pentachlorophenol with ethylenediamine, diethylenetriamine and hexamethylenetetramine in an organic solvent. 2. Wood preservative according to claim 1, characterized in that monohydric or dihydric alcohols, ketones, methylated naphthalenes and/or mineral oil with a content of aromatics are used as organic solvents.