Method of treating wood materials
AssigneePalonot Oy
InventorsJari Kukkonen, Timo Nissinen
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Abstract
Method of treating wood products to improve fire resistance thereof. The method comprises treating wet wood objects with compositions comprising an aqueous solution of bisphosphonate selected from 1-hydroxyethane 1,1-diphosphonic acid, an alkanol amine, and optionally an alkaline agent, the composition having a pH in the range of 4.0 to 7.0 to impregnate the object with the compositions, and subjecting the object so obtained to drying to achieve aspiration of the pits of the wood object. The method can be used for protecting wood not only against fire but also against mould, rot, blue stain, insect such as termite attacks on wood, dimensional changes, or a combination thereof due to environmental influence.
Claims24
A method of treating a wood object, comprising:
- treating the wood object as a wet wood object with an aqueous fire retardant composition to impregnate the wet wood object with the fire retardant composition;
- and
- subjecting the wet wood object thus treated to drying to achieve aspiration of the pits of the wet wood object,
- wherein the fire retardant composition comprises an aqueous solution of a mixture or a reaction product of 1-hydroxyethane-1,1-diphosphonic acid (HEDP) and an alkanol amine, and
- wherein at least 75 mole-% of the alkanol amine is added in free form when mixed or reacted with the 1-hydroxyethane-1,1-diphosphonic acid (HEDP).
Dependencies are inferred from the claim text.