The present disclosure describes a treated cellulosic material comprising a cellulosic material having a porous structure defining a plurality of pores, at least a portion of the pores containing a treating agent comprising a polymer comprising an ol-efin-carboxylic acid copolymer; and a modifying agent comprising an epoxy.

A crosslinking polyvinyl acetate (XPVAc or X-PVAc) adhesive is applied as a primer (i.e., a basecoat) or an exterior coat (i.e., a top coat) on a wood preservation product which is mainly treated with a water-based preservative. By sealing the exterior wood surfaces, the new coating system not only effectively prevents the leaching of the preservative by bonding and chelating with the unfixed preservative compounds or complexes at the surface layer, but it also significantly reduces surface aging of wood, maintains effective preservation functions, and provides a longer service life to the wood preservation product.

The present invention relates to an outdoor bamboo floor and a manufacturing method thereof, in particular, to an outdoor bamboo floor subjected to an immersion treatment using hot oil. Conduits or other capillary structures of a bamboo material in the outdoor bamboo floor of the present invention are filled with an oil medium, with an oil content of 2-10%. The manufacturing method includes immersing a plate blank of the bamboo floor in a hydrophobic organic medium at 100-300 C. for 1-10h, and are statically cooled down to a room temperature after being taken out.

A two-part flame-retardant, a flame-retardant oriented strand (OSB) and method for forming a flame-retardant OSB is provided. The two-part flame-retardant composition includes an aqueous solution containing a water-soluble flame-retardant and a flame-retardant powder that is incorporated into an oriented strand board without substantially affecting the mechanical properties of the oriented strand board. The method includes applying the aqueous solution containing a water-soluble flame-retardant to an oriented strand board furnish and applying a flame-retardant powder to the wetted furnish, without requiring an additional drying step.

A super strong and tough densified wood structure is formed by subjecting a cellulose-based natural wood material to a chemical treatment that partially removes lignin therefrom. The treated wood retains lumina of the natural wood, with cellulose nanofibers of cell walls being aligned. The treated wood is then pressed in a direction crossing the direction in which the lumina extend, such that the lumina collapse and any residual fluid within the wood is removed. As a result, the cell walls become entangled and hydrogen bonds are formed between adjacent cellulose nanofibers, thereby improving the strength and toughness of the wood among other mechanical properties. By further modifying, manipulating, or machining the densified wood, it can be adapted to various applications.

A piece of plant material (e.g., wood) can have a lignin content in a range of 5-16 wt %, inclusive, and a microstructure including native lumina bounded by cellulose-based cell walls extending in a first direction. The piece of plant material can be pressed along a second direction crossing the first direction, such that the lumina collapse and facing portions of the collapsed lumina are brought into contact with each other. The piece of plant material prior to the pressing can have a first density. After the pressing, the piece of plant material can have a second density greater than the first density, for example, at least 1 g/cm.sup.3.

In general, the present disclosure is directed to a method for treating a wood product. The method disclosed herein includes: i) injecting an oil-based preservative into a treatment chamber with the wood product; ii) pressurizing the treatment chamber with the wood product and the oil-based preservative in order to impregnate the wood product with the oil-based preservative; iii) releasing the pressure of the treatment chamber to atmospheric pressure; iv) performing an intermediate drying phase; v) after performing the intermediate drying phase, draining the oil-based preservative from the treatment chamber; and vi) applying a vacuum within the treatment chamber in order to remove excess preservative from surface of the impregnated wood product.

A novel and inventive method of Wood Modification is provided, combining two singular modification strategies for accessible OH group reduction into one, simultaneous hybrid process, by taking advantage of a high-pressure modification process.