Quebracho tannin - hyperbranched polyglycerol blends as adhesives for wood bonding. Applicability of tannin-hyperbranched polyglycerol blends cured with hexamine in wood bonding was investigated. Adhesive performance of the systems was examined. It was shown that strengths of adhesive joints exceeded that of the substrate, therefore it was concluded that hyperbranched polyglycerols might be effective components of tannic adhesives.
Influence of electromagnetic treatment of the mineral filler on properties of the adhesive compositions for plywood production. The influence of pre-activation of natural mineral filler zeolite (clinoptilolite) in the electromagnetic microwave field (EMF) and in a weak pulsed magnetic field (IMP) on the physical, mechanical and chemical properties of adhesive compositions were investigated. The differences in the mechanisms of exposure of EMF and IMP on mineral filler in adhesive composition were identified. Decrease of free formaldehyde content from cured adhesive composition is 23 %. Increase of acidity and reduction of gel time were determined. Addition of clinoptilolite into the adhesive composition increases the strength of the adhesive layer: at untreated sample by 6 %, treated in a weak IMP by 14 % and activated in EMF by 23 %.