Abstract:
Wood is modified by treating with an aqueous water repellent [I] and an emulsion water repellent [II]. The aqueous water repellent [I] comprises a product obtained through co-hydrolytic condensation of (A) an organosilicon compound: (R1)a(OR2)bSiO(4−a−b)/2 and (B) an amino-containing alkoxysilane: R3R4NR5—SiR6n(OR2)3-n. The emulsion water repellent [II] is a trialkylsiloxysilicate emulsion water repellent obtained by polymerizing (C) an organodisiloxane: R73Si—O—SiR73 and (D) a tetraalkoxysilane: Si(OR7)4 in an aqueous solution containing (E) a surfactant and (F) water. Two stages of treatment with repellents [I] and [II] can impart water repellency, minimal water absorption and dimensional stability to wood.
Abstract:
In a first aspect, the present invention provides a method for producing a coating or diffusion layer on a substrate (e.g. a cork) for use in contact with a food product or beverage, said coating or diffusion layer preventing or inhibiting passage therethrough (e.g. from a cork to an alcoholic beverage) of flavour-active or odour-active compounds (commonly known as cork taint), and said method comprising applying to the surface of said substrate an effective amount of a copolymer comprising a flexible component and a retentive component, said flexible component being sufficiently flexible to allow the coated substrate to undergo compression and recovery (e.g. so as to allow a coated cork according to the present invention to be compressed and then to recover during the bottling process) and said retentive component being able to bind with or otherwise retain flavour-active or odour-active compounds. In a second aspect, the present invention provides a coated substrate, and in particular a coated natural or synthetic cork, produced according to that method.
Abstract:
The invention aims at improving a method and a device (17) for the production of veneers (1) and veneered parts (13) and to veneers (1) and veneered parts (13). To this end, a sealing layer (2) is applied on the surface of the veneer (1) before further processing. The device (17) includes a veneer producing device known per se, a finishing station (6), a transporting device (5) and a polishing station (8).
Abstract:
The invention is directed to a method for preparing a recoatable surface on a substrate. The substrate is coated with a base coat composition comprising a polyol acrylate monomer and an epoxy acrylate monomer which is subsequently cured with UV radiation. After curing, the base coat is imaged with a sublimation dye design, typically by contact with a transfer sheet. Advantageously, the imaged base coat can subsequently be coated with a top coat or stain to modify or enhance the properties or appearance of the design.
Abstract:
A process for forming a polyurea coating on a wood composite substrate comprises the steps of applying an isocyanate to an edge of the wood substrate to form a pretreated edge and applying a polymer latex to the pretreated edge to form the polyurea coating. This poluyrea coating provides excellent protection against the penetration of water through the edges and into the interior of the wood composite material and wood composite materials having this polyurea coating have significantly less edge swelling and adsorb considerably less water than wood composites that have no such protective coatings.
Abstract:
The present invention provides a formulation for treating the edge of a wood-based panel. The formulation includes an optical brightener and optional amine such that the treated edge fluoresces when illuminated with ultraviolet light. Wood-based panels treated with the sealant, and methods for making and applying the formulation to a wood-based panel are also provided.
Abstract:
The invention is directed to a method of tempering fiberboard that includes applying a substantially solvent-free, liquid tempering composition on at least one surface of the fiberboard and curing the tempering composition. The tempering composition includes at least one thermoset material such as one-part moisture cure polyurethane. The tempered fiberboard can be used directly as doorskin.
Abstract:
Wood cellulose is treated with a reactive silicate. The reaction is done to cellulose within the wood and may be catalyzed with acid or base catalysts or a carbon silicon halogen combination which produces in situ acid catalysts or a different combination to produce an in situ base catalyst which replaces some of the molecules or atoms within the cellulose structure with silicon, boron or other hydrophobic or anti-degrading agents. Preferably an organic solvent, such as alcohol is used to accelerate the reaction with the water in the wood. Here, the hydroxyl (OH) group on some or all of the cellulose molecules is partially replaced with silicon or an alternative atom or molecule to changes the character of the wood. The process may be modified to insert a preliminary step of adding a reactive agent to be locked into the wood. Manufacturing techniques to enhance the process using ultrasound or other wave generating techniques are also taught.
Abstract:
A method of applying a powder coating to a length of a lignocellulosic material. The method comprises impregnating the length of lignocellulosic material with an impregnating composition (i) a dicarboxylic anhydride or a tricarboxylic anhydride dissolved in non-aqueous solvent; (ii) an isocyanate thermosetting resin dissolved in a non-aqueous solvent; or (iii) a combination of (i) or (ii). Any excess impregnating composition is then removed from the lignocellulosic material. Non-aqueous solvent is also removed and the impregnated lignocellulosic material is placed in either an electrostatic field or in a fluidized bed and a powder coating composition is applied thereto so that the powder coating composition adheres to the lignocellulosic material. The impregnated and coated lignocellulosic material is then subjected to elevated temperatures to polymerise and/or cross-link the resin and cure the powder coating composition to form a powder coating. The length of lignocellulosic material may be a sheet of paper, wood or wood veneer. A typical solvent is dichloromethane or liquid carbon dioxide.
Abstract:
Coating compositions and processes for coating wood and wood materials are described. The compositions comprise a first component comprising at least one reactive thinner and at least one unsaturated polyester, and a second component comprising a curing catalyst. The unsaturated polyester of the first component is the reaction product of: (a) a mixture of at least one saturated aliphatic dicarboxylic acid with 6 to 10 carbon atoms and at least one ethylenically unsaturated aliphatic dicarboxylic acid selected from maleic acid, fumaric acid, itaconic acid, citraconic acid, and mixtures thereof; (b) a diol component consisting of at least one of 1,4-dimethylolcyclohexane and substituted dimethylolcyclohexanes, with up to 50 mol % monomeric or oligomeric glycol, based on total moles of the diol component; and (c) up to 10 mol % of a polyol, based on total moles of polyester reactants. The compositions and processes of the invention result in coatings with improved hardness and aged cold crack resistance.