HIGH MECHANICAL STRENGTH WOOD POLYMER COMPOSITES BY USE OF A NEW POLYURETHANE BINDER SYSTEM

Denitsa Stoyanova Georgieva, Sanchi Nenkova, Michael Herzog, Gerhard Behrendt

Abstract


A new type of binder for wood particles or fibres was developed using a recycled polyol from polyurethane or PET wastes and a polyisocyanate as raw materials. The binders developed with various ratios of hydroxyl and isocyanate groups are solid at room temperature with melting points between 40 and 60°C. Between 5 and 20% of these were mixed with the wood products and compression-moulded at temperatures between 80 and 100°C and 0.75 to 2.05 kp/mm² pressure to give composites of tensile strength up to 47 N/mm2 or flexural strength up to 58 N/mm2.

Keywords


Wood, Composites, Polyurethane, PET, Recycling Polyols

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