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AssigneeValtion Teknillinen Tutkimuskeskus
InventorsHarri Kilpelainen, Pentti Kankaanpaa
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The present invention relates to an adhesive composition for manufacturing glued laminated beams and wood constructions. One component of the adhesive composition is resorcinol-phenol resin. Resorcinol-phenol adhesives are as such known in the prior art. The main ingredients of these adhesives are resorcinol, formaldehyde and phenol. Among the drawbacks in the use and production of resorcinol-phenol adhesives are their high price and the fact that the raw materials are difficult to obtain. The purpose for employing the adhesive composition of the invention is to eliminate some of the difficulties connected with the availability of the raw materials, particularly resorcinol, and to help produce a new, more economical resorcinol-phenol based adhesive composition. Part of the resorcinol-phenol resin used in the adhesive composition is replaced by a humus substance extract made of peat, preferably decomposed peat, or by a commixture made of humus substance extract and formaldehyde, providing an adhesive composition according to the invention which contains 40-90% by weight resorcinol-phenol resin, the dry matter content whereof is 30-60% by weight and 10-60% by weight humus substance extract made from peat. Into this adhesive composition there is added, before use, some generally known hardener such as formaldehyde at 5-20% by weight. Into the humus substance extract of the adhesive composition may be added 10-20% by weight formaldehyde.
Resorcinol-phenol resin based aqueous adhesive composition, comprising a hardenable mixture of 40-90% by weight resorcinol-phenol resin, the dry matter content of which is 30-60% by weight, and 60-10% by weight humus substance extract prepared from peat, the percentages being based on the total composition, the extract being prepared by treating dry ground peat with an aqueous alkaline solution having an alkaline concentration of up to about 5% and sufficiently to extract into the solution the extractable humus content therefrom without extracting the lignin contained in the peat and such that the lignin remains in the solid matter of the peat and drying the alkaline solution extracted humus substance content, and grinding the dried humus substance content and then admixing it with water to form the extract, and including in the composition 5-20% by weight formaldehyde or paraformaldehyde based on the mixture as hardener.
Dependencies are inferred from the claim text.