Disclosed is a modification solution comprising -furfuryl alcohol; -a diluent; -a fire retardant, and -optionally a stabiliser, wherein the fire retardant comprises: -one or more nitrogen resins; and -phosphoric acid; a method of preparation thereof and wood modified therewith to achieve improve fire retardant and decay properties.

An object of the present invention is to provide a flame-retardant woody material having low hygroscopicity and excellent flame-retardant performance, and a flame retardant for woody materials therefor. The present invention relates to a flame retardant for woody materials comprising an organic phosphorus compound represented by the following formula (1) and a nitrogen compound represented by the following 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 the 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 the 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.

Bamboo lumber products and fabrication techniques thereof are provided. Thick-wall bamboo culm is cut into multiple slats, each made up of a solid portion of culm. The slats are laminated, joined, or otherwise combined to form solid panels, boards, or other lumber products. The use of thick-walled bamboo and associated processes as disclosed allows for lumber products that have a lower glue-to-bamboo ratio and therefore provide superior characteristics compared to conventional techniques and products.

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.

A fire-resistant wooden pressure plate is formed by conducting a cold pressing of 2˜10 MPa to the uniformly mixed not less than 50 wt % of a wood-containing powder material and an additive. The additive may include metallic oxide, non-metallic oxide, hydrochloride, sulfate, phosphate, weak acid, and strong acid. With class-A fire resistance, in-water rotting resistance, class-0 mold resistance, little or no detectable formaldehyde, some products described herein can replace traditional plates incapable of resisting fire in the following fields: 1. wooden veneer, wooden door, furniture, kitchenware, etc.; 2. wooden wall, base course, ground foundation, suspended ceiling, etc.; 3. wooden flooring; 4. wooden fire-resistant door, fire-resistant wall, etc.; 5. wooden house, wooden bench, wooden bulletin plate, wooden billboard, walkway paving, etc.; 6. wood handicrafts, toys, etc.

The present invention relates to the creation of thermally insulating materials derived from cellulosic materials by selectively depolymerizing the materials anatomy. Cellulosic materials may be comprised of three main biopolymers: lignin, hemicellulose, and cellulose. The present invention relates to the chemical and physical removal of lignin and hemicellulose, while leaving the cellulose unaltered to induce increased porosity within the material and the material’s macrostructure matrix for use as thermal and acoustic insulation. The increased porosity will be due to the creation of closed cell voids within the cellulosic matrix. These voids will increase the thermal and acoustic insulating performance of the cellulosic materials. The selective removal of secondary biopolymers from cellulosic materials allow for isolation of other value added products that can be regenerated through fewer reactions/steps. This is a novel advantage over other similar processes that dissolve cellulose completely, making it harder to extract and isolate secondary off-stream products.

A method for preventing damage caused by a fire includes extinguishing the fire by applying a fireproof composition to the fire. The fireproof composition is constituted as an aqueous composition comprising at least one sugar and magnesium chloride (MgCl2). The fire can be a forest, domestic, or industrial fire. The composition can also be applied to protect a product against fire.

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.

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 improves the reliability of fire-resistance performance, and suppresses a drop in strength and a drop in Young's modulus for bending, with regard to a structural LVL containing a fireproofing chemical for fire-resistant structural wood material-use. The present invention is the LVL 61 for structural use comprising a plurality of raw material veneers 51 layered in the front-back thickness direction via adhesive layers therebetween. Each of the raw material veneers 51 is a wood material having a fireproofing chemical injected to the interior thereof and is constituted from a site of sapwood part alone, a site of heartwood part alone, or, a site wherein a sapwood part and a heartwood part are mixed. Injection holes 62 are provided, each having a circular cross section and extending in the thickness direction from each of the front surface and the back surface of the LVL 61. The injection holes 62 traverse through the plurality of raw material veneers 51 and the adhesive layers. On the front surface and the back surface, respectively, plurality of the injection holes 62 are aligned while leaving an interval therebetween in the width direction and in the length direction of the LVL 61. The injection holes 61(U) from the front surface and the injection holes 61(D) from the back surface are disposed at different positions from one another in the width direction and in the length direction.