Storage-stable prepregs on the basis of duroplastic,...

Details Storage-stable prepregs on the basis of duroplastic,... Storage-stable prepregs on the basis of duroplastic,...

C - Chemistry, Metallurgy

08

J

C08J 5/24 (2006.01) C08G 59/34 (2006.01) C08J 5/04 (2006.01) C08L 63/10 (2006.01)

Patent

CA 2389539

The aim of the invention is to obtain prepregs on the basis of duroplastic, oleochemical matrices that can be stored at room temperature. To this end, a fiber material that preferably contains natural fibers is contacted with a matrix material at temperatures of 40 to 80 ~C in the presence of a suitable catalyst and the fiber material impregnated with the matrix is cooled to temperatures of 30 ~C and less. The matrix material is chosen from a fatty substance with at least 12 C atoms that contains epoxide and/or hydroxyl groups, a cross-linking agent and a catalyst, and the matrix material has a Brookfield viscosity of 600 to 1400 MPa at temperatures of 40 to 80 ~C.

L'invention concerne des feuilles préimprégnées stables au stockage à température ambiante, à base de matrices lipochimiques thermodurcissables, obtenues par mise en contact d'une matière fibreuse contenant de préférence des fibres naturelles, avec une matière matricielle à des températures comprises entre 40 et 80 ·C, en présence d'un catalyseur approprié. La matière fibreuse imprégnée de la matrice est refroidie à des températures de 30 ·C et moins et la matière matricielle est sélectionnée dans le groupe comprenant un solide ayant au moins 12 atomes de C et contenant des groupes époxy et/ou hydroxyle, un agent réticulant, ainsi qu'un catalyseur. A des températures comprises entre 40 et 80 ·C, la matière matricielle présente une viscosité Brookfield allant de 600 à 1400 mPas.

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