Abstract:
The invention relates to a hardenable composition of epoxy resins, reactive thinning agents containing epoxy groups and the hardener 2,2',6,6'-tettramethyl-4,4'-methylene-bis(cyclohexylamine), the hardening of the composition and the thus obtained hardened epoxy resin, in addition to the corresponding use of 2,2',6,6'-tetramethyl-4,4'-methylene-bis(cyclohexylamine) as a hardener for epoxy resins in hardenable compositions with reactive thinning agents containing epoxy groups.
Abstract:
The invention relates to the acceleration of the hardening of compositions of epoxy compounds and amino or anhydrid hardeners by adding highly-branched polyetheramines. Said highly branched polyetheramines can comprise terminal hydroxy groups (polyols) and/or amino groups (amino-modified). Said amino-modified highly branched polyetheramines can be obtained by subsequent modification of the terminal hydroxy groups of highly branched polyetheramine polyols.
Abstract:
The invention relates to an epoxide resin composition as a matrix component for sheet molding compounds (SMCs) and/or bulk molding compounds (BMCs), comprising a resin component comprising at least one epoxide resin and a hardener component comprising at least one imidazole compound and at least one latent hardener. In said epoxide resin composition, the amount of the imidazole compounds used lies in a range of 0.007 to 0.025 mol per mol of epoxide groups of the entire composition, and the total amount of optionally contained primary amine groups does not exceed a proportion of 0.09 mol per mol of epoxide groups of the entire composition. The invention further relates to a fiber-matrix semifinished-product composition (SMC or BMC composition), comprising said epoxide resin composition as a matrix component and short reinforcing fibers suspended therein and having an average length of 0.3 to 5.0 cm. The fiber-matrix semifinished-product composition can be produced by mixing the constituents, whereupon the composition thickens. The thickened product thus obtained (semisolid fiber-matrix semifinished product) is characterized by a comparatively short maturing time and comparatively long handleability. The invention further relates to the corresponding semisolid fiber-matrix semifinished product, in particular the semisolid SMC, and the corresponding hardened fiber-matrix semifinished product, in particular the hardened SMC. Finally, the invention further relates to a screening method for identifying epoxide-resin-based compositions that are suitable for use as a thermosetting matrix for the production of SMCs.
Abstract:
La presente invención se refiere a una composición de resina de epoxi como componente de matriz para compuestos de moldeo en láminas (SMC) y/o compuestos de moldeo a granel (BMC) que comprende al menos una resina epoxi y un componente endurecedor que comprende al menos un compuesto imidazol y al menos un endurecedor latente en dicha composición de resina epoxi, la cantidad de los compuestos imidazol usada está en el rango de 0.007 a 0.025 moles por mol de grupos epoxi de la composición entera y la cantidad total de grupos amina primarios opcionalmente comprendidos no excede una proporción de 0.09 moles por mol de grupos epoxi de la composición entera. La invención también se refiere a una composición de producto semiacabado de matriz de fibras (composición de SMC o composición BMC), como componente de matriz, con la composición de resina epoxi mencionada y, suspendidas dentro, con fibras cortas de refuerzo con un largo promedio de 0.3 a 5.0 cm. La composición producto semiacabado de matriz de fibras se puede producir por mezcla de los constituyentes, tras lo cual la composición se espesa. El producto espesado resultante (producto semiacabado de matriz de fibras semisólido) caracteriza un tiempo de maduración comparativamente corto y un tiempo operativo disponible comparativamente largo. La invención también se refiere al correspondiente compuesto de matriz de fibras semisólido, en particular al SMC semisólido y al correspondiente producto semiacabado de matriz de fibras curado, en particular el SMC curado. Finalmente, la invención también se refiere a un proceso de control para identificar composiciones a base de resinas epoxi que son apropiadas para usar como matriz termoestable para producir SMC.
Abstract:
The invention relates to an epoxide resin composition as a matrix component for sheet molding compounds (SMCs) and/or bulk molding compounds (BMCs), comprising a resin component comprising at least one epoxide resin and a hardener component comprising at least one imidazole compound and at least one latent hardener. In said epoxide resin composition, the amount of the imidazole compounds used lies in a range of 0.007 to 0.025 mol per mol of epoxide groups of the entire composition, and the total amount of optionally contained primary amine groups does not exceed a proportion of 0.09 mol per mol of epoxide groups of the entire composition. The invention further relates to a fiber-matrix semifinished-product composition (SMC or BMC composition), comprising said epoxide resin composition as a matrix component and short reinforcing fibers suspended therein and having an average length of 0.3 to 5.0 cm. The fiber-matrix semifinished-product composition can be produced by mixing the constituents, whereupon the composition thickens. The thickened product thus obtained (semisolid fiber-matrix semifinished product) is characterized by a comparatively short maturing time and comparatively long handleability. The invention further relates to the corresponding semisolid fiber-matrix semifinished product, in particular the semisolid SMC, and the corresponding hardened fiber-matrix semifinished product, in particular the hardened SMC. Finally, the invention further relates to a screening method for identifying epoxide-resin-based compositions that are suitable for use as a thermosetting matrix for the production of SMCs.