Timber preserving agent for maintenance purposes

Details Timber preserving agent for maintenance purposes Timber preserving agent for maintenance purposes

1998-08-28

2000-08-29

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Contains fireproofing or biocidal agent

106 183, 106 1831, 424404, 424405, 424414, 424443, 424447, 424630, 424632, 424633, 424634, 424635, 424637, 424638, 427 4, 427393, 427397, B27K 352, B27K 500, A01N 5920

Patent

active

061102636

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to the use of a wood preservative for the afterprotection of wood, comprising a copper compound, a polyamine and an inorganic fungicide, and a bandage for the afterprotection of wood, which contains this wood preservative.
For the aftercare of transmission-line poles in the supply network of the post office and electricity supply companies or similar round wood stocks, in particular in the area of the ground-air zone, bandages containing water-soluble wood preservatives are applied. It is known to employ water-soluble salts based on inorganic fluorine compounds for this, such as, for example, alkali metal fluorides, in some cases in combination with alkali metal bichromate or boron compounds such as boric acid or borax. These salts, however, are exclusively active against wood-destroying Basidiomycetes, the soft rot activity for installation with soil contact is absent. Proposed substances having soft rot activity are, on the one hand, dinitrophenol (Barry A. Richardson: Wood preservation--The Construction Press Ltd., Lancaster p. 181) or combinations of the abovementioned compounds with water-soluble copper salts such as, for example, copper sulfate or copper acetate. Mixtures of copper sulfate, also in combination with alkali bichromate, with boric acid and copper acetate with alkali metal fluoroborates are prior art. Dinitrophenol has meanwhile been excluded because of its toxicity.
The water-soluble abovementioned copper compounds on their own, but also in the abovementioned combinations, do not have good diffusion power adequate to penetrate, for example, the sapwood of pine poles, even on long standing, and to reach the core.
Wood preservatives based on copper and amines as complexing agents have been proposed for large-scale impregnation, in particular boiler pressure impregnation.
EP-B 211 181 relates to a wood preservative based on a copper salt and monoethanolamine for the boiler pressure impregnation of wood.
EP-B 270 848 describes a wood preservative based on a copper compound, a carboxylic acid and an aliphatic polyamine for boiler pressure impregnation.
EP-A 423 674 describes a wood preservative based on a metal salt of an N-organyldiazeniumdioxy compound and a complex-forming polymeric amine for the boiler pressure process.
It is common to all the wood preservatives described above that they have a high fixing power for the copper in the wood. By means of this, the diffusion power of the copper is restricted, which is why these systems are unsuitable for the afterprotection of wood.
Known, currently used systems for the afterprotection of wood contain, for example, combinations of copper naphthenate, boron and fluorine compounds. An example of this type of product, which is mainly used in the USA, is CURAP 20 (manufacturer: naK Biotech), a paste which contains 18.16% of amine-based copper naphthenate and 40% of sodium tetraborate decahydrate. Investigations on poles (species of wood Douglas fir or pine) which had been treated with this product showed after a service life of from 1 to 3 years that copper for the major part is virtually only distributed near to the surface (0-10 mm) in the wood (with investigated penetration depths of up to 25 mm) and these products thus only have a very restricted diffusion power for copper (Conserving energy by environmentally acceptable practices in maintaining and procuring transmission poles. 15th annual report, September 1995, J. J. Morrell, Oregon State University, Corvallis, Oreg.).
The subsequently published WO 96/233636 describes wood preservatives in paste form, which comprise a fungicidal metal compound and a fungicidal boron compound. The metal compounds also include copper complexed with aminocarboxylic acids or polycarboxylic acids.
The subsequently published WO 96/233635 describes a wood preservative which comprises a metal chelate. Copper complexes with amino acids, iminodiacetic acid, ethylenediaminotetraacetic acid, dicarboxylic acids and polyphosphates are described.
It is an object of the present invention to

REFERENCES:
patent: 4761179 (1988-08-01), Goettsche et al.
patent: 4857322 (1989-08-01), Goettsche et al.
patent: 5276029 (1994-01-01), Goettsche et al.
patent: 5342438 (1994-08-01), West
Richardson, Wood Preservation, The Construction Press Ltd., p. 181. (1978) (no month).

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