The present disclosure provides a method for recycling urea-formaldehyde (UF) from a wood-based panel. In the present disclosure, the UF is depolymerized by an ultrasonic treatment, and depolymerized UF can be reused for UF manufacture and wood-based panel production. The recycled and treated UF can be repeatedly used in wood-based panel manufacture without affecting performances of the wood-based panel. UF-glued wood-based panels can be recycled, and a recycled wood-based panel raw material can replace at least 50% of a non-recycled wood-based raw material for particle board production without affecting performances of the wood-based panel.

The present disclosure provides a method for recycling urea-formaldehyde (UF) from a wood-based panel. In the present disclosure, the UF is depolymerized by an ultrasonic treatment, and depolymerized UF can be reused for UF manufacture and wood-based panel production. The recycled and treated UF can be repeatedly used in wood-based panel manufacture without affecting performances of the wood-based panel. UF-glued wood-based panels can be recycled, and a recycled wood-based panel raw material can replace at least 50% of a non-recycled wood-based raw material for particle board production without affecting performances of the wood-based panel.

A carrier material has a resin layer arranged on a side of the carrier material. The resin layer includes a formaldehyde resin, a polymer selected from a group containing polyacrylates, polyepoxides, polyesters, polyurethanes, and long-chain silanols, and at least one silane-containing compound of general formula (I), R.sub.a SiX.sub.(4-a), and/or the hydrolysis product thereof, where X is H, OH, or a hydrolyzable residue selected from the group comprising halogen, alkoxy, carboxy, amino, monoalkylamino or dialkylamino, aryloxy, acyloxy, alkylcarbonyl; R is a non-hydrolyzable organic residue R selected from the group comprising alkyl, aryl, alkenyl, substituted and unsubstituted alkynyl, cycloalkyl, which can be interrupted by O or NH; and where R can have a functional group Q selected from a group containing a hydroxy, ether, amino, monoalkylamino, dialkylamino, anilino, amide, carboxy, mercapto, alkoxy, aldehyde, alkylcarbonyl, epoxide, alkenyl, alkynyl, acryl, acryloxy, methacryl, methacryloxy, cyano, and isocyano group, and a is 0-3.

Processes of making a non-woven glass fiber mat are described. The process may include forming an aqueous dispersion of fibers. The process may also include passing the dispersion through a mat forming screen to form a wet mat. The process may further include applying a carbohydrate binder composition to the wet mat to form a binder-containing wet mat. The binder compositions may include a carbohydrate, a nitrogen-containing compound, and a thickening agent. The binder compositions may have a Brookfield viscosity of 7 to 50 centipoise at 20? C. The thickening agents may include modified celluloses such as hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC), and polysaccharides such as xanthan gum, guar gum, and starches. The process may include curing the binder-containing wet mat to form the non-woven glass fiber mat.

Processes of making a non-woven glass fiber mat are described. The process may include forming an aqueous dispersion of fibers. The process may also include passing the dispersion through a mat forming screen to form a wet mat. The process may further include applying a carbohydrate binder composition to the wet mat to form a binder-containing wet mat. The binder compositions may include a carbohydrate, a nitrogen-containing compound, and a thickening agent. The binder compositions may have a Brookfield viscosity of 7 to 50 centipoise at 20? C. The thickening agents may include modified celluloses such as hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC), and polysaccharides such as xanthan gum, guar gum, and starches. The process may include curing the binder-containing wet mat to form the non-woven glass fiber mat.

A compressed article formed by a composite material comprising a thermoset polymer and a wood material, a method of producing the same and the use of the novel articles. The composite material has a continuous matrix of a hardened thermoset polymer and, distributed within the matrix, wood chips which are at least partially encased by the thermoset polymer, said article having a water absorbency of less than 1% by weight upon immersion into water over a time period of at least 168 h at room temperature. The articles can be used in structures that are frequently contacted with water.

A compressed article formed by a composite material comprising a thermoset polymer and a wood material, a method of producing the same and the use of the novel articles. The composite material has a continuous matrix of a hardened thermoset polymer and, distributed within the matrix, wood chips which are at least partially encased by the thermoset polymer, said article having a water absorbency of less than 1% by weight upon immersion into water over a time period of at least 168 h at room temperature. The articles can be used in structures that are frequently contacted with water.

A bio-composite material comprises protein-containing non-wood fibrous biomass comprising at least 6 wt % protein, and a cross-linking agent. The bio-composite material may optionally further contain wood biomass, or non-protein-containing non-wood biomass, and is formable into a bio-composite board to replace wood-based boards for a variety of applications. A bioplastic material comprises a bioadhesive, fibrous biomass and a plastic material, and is formable into a variety of products, such as a cup, using conventional plastic processing techniques. Suitable fibrous biomass may include used coffee grounds and a variety of other biomass. A method of forming a board from a bio-composite material, and a method of manufacturing a bioplastic are also provided.

A bio-composite material comprises protein-containing non-wood fibrous biomass comprising at least 6 wt % protein, and a cross-linking agent. The bio-composite material may optionally further contain wood biomass, or non-protein-containing non-wood biomass, and is formable into a bio-composite board to replace wood-based boards for a variety of applications. A bioplastic material comprises a bioadhesive, fibrous biomass and a plastic material, and is formable into a variety of products, such as a cup, using conventional plastic processing techniques. Suitable fibrous biomass may include used coffee grounds and a variety of other biomass. A method of forming a board from a bio-composite material, and a method of manufacturing a bioplastic are also provided.

It is disclosed chitosan-reinforced urea-formaldehyde (UF) adhesives for bonding wood-based composites, such as plywood and particleboard, or other fibrous materials and the method of producing the adhesives. The adhesives are produced by mixing unmodified chitosan containing raw material and a urea-formaldehyde resin to produce wood composite adhesive resins.