Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants
Patent
1994-03-28
1997-03-18
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Biocides; animal or insect repellents or attractants
424409, A01N 2500
Patent
active
056120460
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the production of compounds which have fungicidal and insecticidal properties and their use in wooden or timber structures to combat fungal and insect deterioration.
BACKGROUND OF THE INVENTION
The service life of wooden structures is greatly reduced by biodegradation processes caused by fungal decay such as soft rot, white and brown rot and attack by insects such as damp wood and dry wood termites. It is therefore desirable to treat wooden structures in some way to combat biodegradation to greatly increase their service life.
It has been found that the service life of wooden structures, can be considerably increased if they are inspected regularly and given remedial chemical treatment. Various methods of remedial treatment of wooden structures have been used and include the pouring of treatment liquids such creosote onto the external surface of the wooden structure or the application of bandages containing preservatives. While both of these methods are effective, they have gained only limited acceptance because they are messy and much of the chemical is lost to the environment.
The introduction of diffusible biocides into the interior of a pole should be an effective way of preventing or delaying deterioration but this method has not become a routine procedure because materials and a delivery system which is cost effective are not available.
Australian Patent No. 527,240 discloses the use of a fused monolithic body of boric oxide which dissolves over an extended period into the moisture present in the wood structure to form solution toxic to organisms responsible for decay. As the shaped monolithic bodies are formed by a melt extrusion process in excess of 1000.degree. C., practical processing problems arise and the use of these bodies has consequently not gained wide acceptance, due to their high cost in addition they are extremely slow release and can take many years to fully dissolve even in wood with moisture content in excess of 25%.
U.S. Pat. No. 4,661,157 discloses the use of boron compounds capable of binding with water by hydration to form shaped bodies. The hydration of boron compounds by the method in the above U.S. Patent occurs quickly and results in a product relatively low in density and strength. The above patent suggests the mixing of the boron compounds with various carrier materials to increase the strength but this also has the effect of reducing the relative proportion of active ingredients in the rods and consequently the effectiveness of the shaped bodies.
SUMMARY OF THE INVENTION
The applicant has found that a stronger and denser rod can be formed by the hydration of a mixture of boron and fluorine compounds. Accordingly the invention provides a process for the production of a shaped body for use as a wood preservative insert comprising the steps of mixing together at least one hydratable boron compound and at least one fluorine compound, to form a dry mixture and adding water to said mixture to form a paste, shaping the paste and allowing the paste to set to form the shaped body.
The addition of the fluorine compound which is itself a biocide enables the hydration reaction to be more easily controlled. A slower rate of reaction and longer reaction time results in a denser and stronger shaped body. Consequently, additive materials are not required to increase the strength or density of the shaped bodies but may be added if required.
Fluoroborate complexes are also produced by the reaction of boron compounds with fluorine compounds. The complexes are also capable of hydrating and have the advantage of exhibiting lower mammalian toxicity.
After the paste is shaped it may be cooled to slow the rate of the hydration reaction to a rate which will provide a product with the desired properties. By controlling the rate of hydration the final strength and density properties of the shaped bodies can be controlled.
In accordance with another aspect of the invention, there is provided a shaped body for use as a wood preservative insert comprisin
REFERENCES:
patent: 3247059 (1966-04-01), Bauer
patent: 4778833 (1988-10-01), Van der Drift et al.
Chin Chen-Woo
McEvoy Christopher N.
Howard Sharon
Page Thurman K.
Saneish Pty Ltd.
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