Manufacturing process for high performance lignocellulosic...

B - Operations – Transporting – 29 – C

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B29C 70/12 (2006.01) B27N 1/00 (2006.01) B32B 21/08 (2006.01) D21B 1/34 (2006.01)

Patent

CA 2527325

The present invention relates to a process for the manufacture of structural recyclable thermoplastic composites where lignocellulosic fibres are well dispersed in a thermoplastic matrix while maintaining an average fibre length not below 0.2 mm. The process consists of defibrillation the lignocellulosic fibres in the presence of surface active agents using a high shear mixer and at a temperature less than the melting point of surface active agent to individualize and separate the fibres, decrease fibre diameter and form microfibrils, followed by dispersion of the cellulosic fibres in the thermoplastic matrix by intensive mechanical mixing to get the moldable thermoplastic composition, followed by injection or compression or compression injection molding of said composition. The process produces high performance composite materials having a tensile strength not less than 55 MPa, a flexural strength not less than 80 MPa, a stiffness not less than 2 GPa, notched impact strength not less than 20 J/m, and un- notched impact strength not less than 100 J/m. The invention also relates to the use of the said composites in automotive, aerospace, furniture, sports articles, upholstery and other structural applications.

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