Method for producing a reinforced fiber composite

Details Method for producing a reinforced fiber composite Method for producing a reinforced fiber composite

D - Textiles, Paper

06

M

D06M 13/388 (2006.01) D04H 1/64 (2006.01) D06M 23/10 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2251728

The invention relates to a method for producing a reinforced fiber composite which contains cellulosic fibers, the cellulose being present in the crystalline structure cellulose II, by bringing said fiber composite into contact with an aqueous solution of N-methylmorpholin-N-oxide (NMMO) at an elevated temperature and subsequently washing said fiber composite. Said method is characterized in that the fiber composite is brought into contact with the aqueous solution in such a way that the reationship -947 + 0.30xlog(10)t + 0.046xT - 3.53xC + 645xlog(10)C where t is the time in minutes during which the fiber composite is kept in contact with the aqueous NMMO solution, T is the temperature of the aqueous NMMO solution in ~C and C is the concentration of the NMMO in % mass in relation to the aqueous NMMO solution, gives a figure in the region of 0.30 and 1.70 on the condition that the temperature T is less than 130 ~C and the concentration C lies in the region of 70 to 84 % mass.

L'invention concerne un procédé de fabrication d'une nappe de fibres renforcée contenant des fibres cellulosiques. La cellulose est présente sous la forme de la structure cristalline cellulose II. Ce procédé consiste à mettre en contact la nappe de fibres avec une solution aqueuse de N-méthylmorpholin-N-oxyde (NMMO) à une température élevée puis à laver la nappe de fibres. Le procédé selon l'invention est caractérisé en ce que la mise en contact est réalisée de telle manière que l'on obtienne un nombre compris entre 0,30 et 1,70 pour la relation -947 + 0,30xlog¿(10)? t + 0,046xT - 3,53xC + 645xlog¿(10)? C où t représente le temps, exprimé en minutes, pendant lequel la nappe de fibres est mise en contact avec la solution aqueuse de NMMO, T représente la température de la solution aqueuse NMMO en ·C et où C représente la concentration de NMMO en % en masse, par rapport à la solution aqueuse de NMMO, cela à condition que la température T soit inférieure à 130 ·C et la concentration C soit comprise entre 70 et 84 % en masse.

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