Alkaline Aluminosilicate Binder for Gluing Wood Board Materials

Abstract

Organic adhesive – bonded wood board materials like particleboards, plywood and others are widely used in construction, furniture, car- making, etc. However, all materials made with organic adhesives release non-reacted toxic substances, in particular formaldehyde and phenol, which produce negative effects on human health during production and use. Current trend in wood processing industry is to replace organic binders used as adhesives by inorganic ones. One of such solutions to improve indoor air quality is to replace organic adhesives by inorganic ones and the use of the alkaline aluminosilicate binders of the system R2O-Al2O3-SiO2-H2O is a highly advantageous solution and no need of preliminary treatment of wood. Among disadvantages are the low elasticity. Among disadvantages of these binders restricting their use as adhesives are low elastic properties (high modulus of elasticity, stiffness) of the resulted wood-based products. The paper covers the results of modification of the alkaline aluminosilicate binders to improve properties using specially chosen organic additives – modifiers

Determining the effect of the composition of an aluminosilicate binder on the rheotechnological properties of adhesives for wood

“…According to work [9], it is expedient to use adhesives with a ratio of basic structure forming oxides SiO 2 /Al 2 O 3 = = 4.5 and SiO 2 /H 2 O = 17.5 for gluing wood arrays. The adhesives at ratio SiO 2 /Al 2 O 3 = 6 and SiO 2 /H 2 O = 20, representing a more elastic system [27][28][29][30][31], should be use to glue plywood and structural elements with an enhanced flame resistant of the adhesive joint.…”

“…The share of mineral adhesives is insignificant and they are mainly used for gluing cellulose-containing materials. It is promising in order to glue wood arrays to use mineral aluminosilicate-based adhesives [9]. They should ensure, at the level of organic ones, that the adhesive joint strength is not lower than strength of wood for chipping along the fibers and stretching across the fibers.…”

STUDY OF THE INFLUENCE OF COMPOUNDS OF THE ANO3 and ANO3 nH2O TYPES ON RHEOKINETIC AND COLLOID-CHEMICAL PROPERTIES OF ALUMINOSILICATE ADHESIVES FOR WOOD

“…An alternative to organic-based adhesives is mineral adhesives, in particular aluminosilicate adhesives, which are non-flammable and have high mechanical strength. Object of research: rheokinetic patterns and processes of formation of colloidal-chemical structures of aluminosilicate adhesives modified with compounds of the ANO 3 and ANO 3 •nH 2 O type. Investigated problem: Considering that aluminosilicate adhesives are multiphase reactive suspensions, the viscosity of which changes over time and affects their viability, the issue of viscosity stabilization due to the introduction of electrolyte salts into their composition is relevant, and will also contribute to improving the wettability and spreading of the adhesive during applying them to substrates and gluing samples from various types of wood.…”

“…Investigated problem: Considering that aluminosilicate adhesives are multiphase reactive suspensions, the viscosity of which changes over time and affects their viability, the issue of viscosity stabilization due to the introduction of electrolyte salts into their composition is relevant, and will also contribute to improving the wettability and spreading of the adhesive during applying them to substrates and gluing samples from various types of wood. Main scientific results: The effect of the concentrations of compounds of the ANO 3 and ANO 3 •nH 2 O type on the rheokinetic and chemical-colloidal properties of the aluminosilicate adhesive has been established, which will make it possible to use aluminosilicate adhesives in practice for gluing wood of various species, as well as to work out possible technological methods of their application, taking into account the obtained data on the viscosity, wetting and spreadability of the modified adhesive on the surface of the wood substrate. Area of practical use of the research results: woodworking enterprises for the production of glued solid wood products.…”

“…Area of practical use of the research results: woodworking enterprises for the production of glued solid wood products. Innovative technological product: aluminosilicate adhesives modified with ANO 3 and ANO 3 •nH 2 O nitrate additives for gluing wood of various species. Scope of application of an innovative technological product: the application of these approaches will make it possible to obtain glued materials from wood from different species with improved technological and physical and mechanical properties of the glue seam and, accordingly, to increase the quality and reliability of products.…”