Disclosed is a flame retardant for woody materials comprising an organic phosphorus compound represented by formula (1) and a nitrogen compound represented by formula (2); and also relates to a flame-retardant woody material comprising a woody material fireproofed with the flame retardant for woody materials:

##STR00001## wherein in formula (1), R.sub.1 and R.sub.2 are the same or different, and each represents a hydrogen atom, hydroxy, or the like; n is an integer of 1 to 4; X.sub.1 and X.sub.2 are the same or different, and each represents a hydrogen atom, hydroxy, or the like; and

##STR00002## wherein in formula (2), R.sub.3, R.sub.4, R.sub.5, R.sub.6, and R.sub.7 are the same or different, and each represents a hydrogen atom, methyl, or the like.

Disclosed is a flame retardant for woody materials comprising an organic phosphorus compound represented by formula (1) and a nitrogen compound represented by formula (2); and also relates to a flame-retardant woody material comprising a woody material fireproofed with the flame retardant for woody materials:

##STR00001## wherein in formula (1), R.sub.1 and R.sub.2 are the same or different, and each represents a hydrogen atom, hydroxy, or the like; n is an integer of 1 to 4; X.sub.1 and X.sub.2 are the same or different, and each represents a hydrogen atom, hydroxy, or the like; and

##STR00002## wherein in formula (2), R.sub.3, R.sub.4, R.sub.5, R.sub.6, and R.sub.7 are the same or different, and each represents a hydrogen atom, methyl, or the like.

The present invention provides a wood preservative formulation comprising an isothiazolone, an organic fungicidal timber decay preservative and an unsaturated carboxylic or sulphonic acid, salt or anhydride thereof. The formulations of the invention are surprisingly effective at protecting wood and other cellulosic substrates, in particular at providing prolonged protection against in-service surface staining. The invention also provides methods for treating wood and other cellulosic substrates with said formulations.

The present invention provides a wood preservative formulation comprising an isothiazolone, an organic fungicidal timber decay preservative and an unsaturated carboxylic or sulphonic acid, salt or anhydride thereof. The formulations of the invention are surprisingly effective at protecting wood and other cellulosic substrates, in particular at providing prolonged protection against in-service surface staining. The invention also provides methods for treating wood and other cellulosic substrates with said formulations.

An aqueous dispersion of octylisothiazolinone has been found to be useful for delivering OIT to wood for protecting the wood from fungal discoloration. The OIT dispersion can be applied to the wood to develop a protective barrier of preservative relatively at or near the exterior surface of the woodpiece.

An aqueous dispersion of octylisothiazolinone has been found to be useful for delivering OIT to wood for protecting the wood from fungal discoloration. The OIT dispersion can be applied to the wood to develop a protective barrier of preservative relatively at or near the exterior surface of the woodpiece.

A method for reinforcing and enhancing bamboo/wood materials employs a sulfuric acid hydrolysis method to prepare a nanocellulose dispersion solution; then with the nanocellulose dispersion solution having a certain concentration as a precursor, nano zinc oxide is in-situ produced on the surface of the nanocellulose; and the cellulose dispersion solution is improved by compounding. The obtained treatment solution is impregnated into the pores of bamboo/wood materials in a specific manner to play the role of filling, binding and consolidating the bamboo/wood tissues, so that the treated bamboo/wood materials have enhanced hardness, strength and dimension stability, and significantly-improved mildew- and corrosion-resistance. The method is suitable for the reinforcing and enhancing treatment of wood materials with relatively-loose texture, such as fast-growing wood and wood from a planted forest, and is also suitable for the reinforcement and restoration of slightly-rotten wood materials.

A method for reinforcing and enhancing bamboo/wood materials employs a sulfuric acid hydrolysis method to prepare a nanocellulose dispersion solution; then with the nanocellulose dispersion solution having a certain concentration as a precursor, nano zinc oxide is in-situ produced on the surface of the nanocellulose; and the cellulose dispersion solution is improved by compounding. The obtained treatment solution is impregnated into the pores of bamboo/wood materials in a specific manner to play the role of filling, binding and consolidating the bamboo/wood tissues, so that the treated bamboo/wood materials have enhanced hardness, strength and dimension stability, and significantly-improved mildew- and corrosion-resistance. The method is suitable for the reinforcing and enhancing treatment of wood materials with relatively-loose texture, such as fast-growing wood and wood from a planted forest, and is also suitable for the reinforcement and restoration of slightly-rotten wood materials.

A method for preparing a treated cellulosic material comprising: providing a cellulosic material; a treatment protocol comprising impregnating the cellulosic material with an aqueous dispersion comprising a polybutene and a stabilizing agent.

A method for preparing a treated cellulosic material comprising: providing a cellulosic material; a treatment protocol comprising impregnating the cellulosic material with an aqueous dispersion comprising a polybutene and a stabilizing agent.