agent for preserving wood and wood materials, liquid composition for impregnating woodthe obtained by diluting agent and manufacturing process of an agent for the preservation of wood

摘要

A water-dilutable wood preservative concentrate which does not require a substantial amount of petroleum derived solvent comprises, by weight, from 80 to 95% of at least one water-soluble inorganic salt which preferably has fungicidal and/or insecticidal and/or wood preservative properties and is substantially free from hexavalent chromium compounds, and from 20 to 5% of an insecticidal concentrate which can be emulsified in water. The insecticidal concentrate comprises, by weight, from 01 to 30 parts of at least one organic, water-insoluble insecticide, preferably a contact insecticide, from 20 to 60 parts of at least one organic water-insoluble solvent which may be an oil of low volatility and/or a plasticiser, and from 20 to 70 parts of at least one non-ionic emulsifier. The wood preservative concentrate can be diluted with water in the proportions of 5 to 15 parts by weight of concentrate to 95 to 85 parts by weight of water to form an aqueous solution, emulsion or dispersion which can be used to preserve wood by coating, impregnation and other methods. A process for making the concentrate is described by treating insecticide, and solvent at a temperature of 0 to 80 DEG C., and under a pressure of 0.5332 to 1.332 bars until a solution is formed. The solution is combined with the emulsifier at a temperature below 50 DEG C., and the resulting mixture is added to the inorganic salt.