| 摘要 |
In a process for the preparation of a magnetisable filler-containing, free-flowing, latently reactive, phenolically curable epoxy resin composition, a reaction resin mixture of polyepoxy and polyisocyanate resin which contains magnetisable filler and is thermally polymerisable has a molecular ratio between the epoxy groups and the isocyanate groups of > 1 is used to prepare, at reaction temperatures of up to 180 DEG C using substituted imidazole as a reaction accelerator, an isocyanate group-free, latently reactive, prepolymeric epoxy resin mixture containing oxazolidinone and/or isocyanurate structures in powder form, and the prepolymeric epoxy resin mixture is mixed with a pulverulent, magnetisable filler-containing phenolic resin mixture in a molar ratio between the epoxy groups and the phenolic hydroxyl groups of from 1:0.4 to 1:1.1, optionally with addition of further magnetisable filler and/or additives. |
