EPOXY-RESIN COMPOSITION FOR FIBER-MATRIX SEMIFINISHED PRODUCTS

摘要

The present invention relates to an epoxy-resin composition as matrix component for sheet molding compounds (SMC) and/or bulk molding compounds (BMC), comprising a resin component comprising at least one epoxy resin and a hardener component comprising at least one imidazole compound and at least one latent hardener. In said epoxy-resin composition, the amount of the imidazole compounds used is in the range from 0.007 to 0.025 mol per mole of epoxy groups of the entire composition, and the total amount of primary amine groups optionally comprised does not exceed a proportion of 0.09 mol per mole of epoxy groups of the entire composition. The invention also relates to a fiber-matrix-semifinished-product composition (SMC composition or BMC composition) with, as matrix component, the epoxy-resin composition mentioned, and with, suspended therein, short reinforcement fibers with an average length of from 0.3 to 5.0 cm. The fiber-matrix-semifinished-product composition can be produced via mixing of the constituents, whereupon the composition thickens. The resultant thickened product (semisolid fiber-matrix semifinished product) features comparatively short maturing time and comparatively long available operating time. The invention also relates to the corresponding semisolid fiber-matrix composite, in particular to the semisolid SMC and to the corresponding cured fiber-matrix semifinished product, in particular the cured SMC. Finally, the invention also relates to a screening process for identifying epoxy-resin-based compositions which are suitable for use as thermoset matrix for producing SMC.

主权项

1. A fiber-matrix-semifinished-product composition comprising:
an epoxy-resin composition comprising:
a resin component comprising at least one epoxy resin, anda hardener component at least one imidazole compound and at least one latent hardener (B2), and short reinforcement fibers having an average length of 0.3 cm to 5.0 cm suspended in the epoxy-resin composition; wherein: the amount of the imidazole compound 0.007 mol to 0.025 mol, per mole of epoxy groups of the fiber-matrix-semifinished-product composition, and the fiber-matrix-semifinished-product composition optionally comprises primary amine groups, the total amount thereof does not exceed a proportion of 0.09 mol per mole of epoxy groups of the fiber-matrix-semifinished-product composition.