Abstract:
Polyurea/polyurethane coatings can be applied in situ to the edges of substrates without the need for adding any additives to increase flowability or moldability. The in situ application utilizes the extremely fast cure time of polyurea/polyurethanes to provide a method for efficiently creating an article with a protected edge coat by spray applying polyurea/polyurethane to wood substrates. The polyurea/polyurethane will adhere solidly to the substrate, and is applied with sufficient thickness to provide resistance to chemical, environmental, or physical stresses perpendicularly and angularly directed at the edge. The method utilizes a spray gun at high temperature and pressure, combining isocyanate and amine components of the polyurea/polyurethane coating at the nozzle and impinging the combined components onto the edge to be treated. The product of this process gives off no volatile organic compounds (VOCs), is odor free, peel resistant, and sterilized.
Abstract:
A method of coating heat sensitive materials with powder paint is described, which is based on repetitive heating cycles of paint coating by radiation example infrared, interspersed with cooling cycles, which there is a temperature difference between the paint coating and substrate such as to allow the filmation and subsequent curing of the paint without damaging the substrate.
Abstract:
A wood product is protectively coated while maintaining the appearance of wood without discoloration by applying to the surface of a dry wood member a sealer coating containing a cyclic epoxy and an anhydride and curing the sealer, while reacting, at least a portion of the epoxy with lignin in the wood and at least a portion of the anhydride with cellulose and lignin in the wood, to bind the sealer to the wood, and cross linking cellulose, followed by applying a protective coating over the sealer before the sealer has been cured completely to bind the protective coating to the sealer. The protective coating provides a barrier to UV penetration and increases the durability of the surface.
Abstract:
An anti-skid coating composition for coating various substrates including structural panel board surfaces, comprises a binder made of urea formaldehyde resin, polyvinyl acetate, ammonium chloride and a dispersant. The binder is used in conjunction with an aggregate, such as walnut shells. A method is also provided for coating the substrates to impart slip resistance thereto.
Abstract:
A protective surface coating composition containing polyol, glycoluril, and emulsion polymer can be heat cured to produce cured films on substrates. The coating is particularly useful as wood coatings.
Abstract:
Foamed liquid mixtures are applied to substrates, in particular foamed plywood glues, are spread on traveling wood veneers in the manufacture of plywood by a method comprising the following steps: The liquid is withdrawn from a source of the same, is subjected to a mechanical beating action wherein its density is reduced and is then passed to a reservoir or feed storage vessel. Density-reduced liquid is then foamed and the foam is continuously extruded or otherwise spread on an intermittently-moving substrate during the periods of motion of the substrate. The foamed liquid is continuously diverted from the substrate during the periods of rest of the substrate. The diverted foamed liquid then is defoamed by subjecting it to the same mechanical beating action applied to the liquid thereby increasing its density to substantially that of the density-reduced liquid. Thus, there is obtained a uniform density feed to the foamer making possible a uniform application of foamed liquid on the substrate even though the motion of the substrate is started and stopped at frequent intervals.
Abstract:
Prepolymerized resins are applied to wooden articles to coat them and impart a tough and abrasive resistant surface which protects the articles from deterioration and delamination due to shock, impact and abrasive forces. The resins are applied by contacting the articles with a prepolymerized resin which has been dissolved in a readily vaporizable solvent to form a resin solution, coating the article with the resin solution, vaporizing the solvent from the resin coating and drying the resin coating. The coated articles find particular utility in high shock and impact uses such as hockey stick blades.
Abstract:
Method for bonding a room temperature vulcanisable silicone rubber to a porous substrate of masonry or wood. The method involves applying to the porous substrate a primer composition comprising a cyclised rubber resin, an organic solvent and a film-forming polyester resin in a proportion of from 0 to 40% by weight based on the weight of cyclised rubber resin. The primed surface is dried and a room temperature vulcanisable silicone rubber composition of specified type then applied.
Abstract:
Stable, aqueous, colloidal synthetic resin compositions comprising: (1) from about 0.1 percent by weight to about 60 percent by weight of a colloidal synthetic resin; and (2) from about 0.01 percent by weight to about 2 percent by weight based on the dry solids weight of the colloidal synthetic resin of a reaction product of a zirconyl complex salt and a high molecular weight, water-soluble, polymeric, polycarboxy-containing thickening resin; said zirconyl complex salt having the formula R3ZrOR''A3 wherein R is ammonium, hydrogen, or an alkali metal; Zr and O are zirconium and oxygen; R'' is ammonium, hydrogen, or an alkali metal; and A is a divalent anion; and methods of applying the synthetic resin compositions to porous absorbent materials and controlling the migration or spreading thereon or penetration thereinto by applying the synthetic resin compositions to the porous absorbent materials and substantially immediately diluting the synthetic resin composition to substantially immediately coagulate and precipitate the synthetic resin composition.
Abstract:
A wood article is surface-treated by first pretreating the same with a condensable or polymerizable hydrophilic liquid monomer, substantially free of any solvent, in order to cause the wood to swell and/or to dissolve constituents of the wood. The resulting pretreated wood article is then directly treated with an impregnating agent, that reacts with such monomer, to form a condensate or polymerizate with the monomer. Finally, the impregnated condensate or polymerizate thus formed in the resulting treated wood is hardened.