Epoxy acid thermoset resins and composites that can be hot-fashioned and recycled

摘要

Resins and thermoset composites comprising them, these materials being able to be hot-fashioned. These compositions resulting from placing at least one thermosetting resin precursor, this thermosetting resin precursor comprising hydroxyl functions and/or epoxy groups, and optionally ester functions, in contact with at least one hardener chosen from carboxylic acids, in the presence of at least one transesterification catalyst whose total molar amount is between 5% and 25% of the total molar amount of hydroxyl and epoxy contained in the thermosetting resin precursor. Process for manufacturing these materials, process for transforming and process for recycling these materials. New solid forms of resins and of thermoset composites that may be used in the implementation of these processes.

主权项

1. A hot transformable and repairable, after hardening thermosetting resin composition prepared by contacting at least one thermosetting resin precursor comprising hydroxyl functions and/or epoxy groups with at least one carboxylic acid hardener in the presence of at least one transesterification catalyst the total molar amount of which is between 5% and 25% of the total molar amount of hydroxyl and epoxy contained in the thermosetting resin precursor to form a thermosetting resin as a network, wherein NA NO denotes a number of moles of hydroxyl functions in the precursor; Nx denotes a number of moles of epoxy group in the precursor; and NA denotes a number of moles of acid functions of the hardener that are capable of forming a bond with a hydroxyl function or with an epoxy group of the thermosetting polymer precursor, wherein the carboxylic acid hardener comprises a mixture of fatty acid dimers and trimers comprising 2 to 40 carbon atoms, and wherein the composition, after hardening, is able to be heated to temperatures such that the composition becomes liquid without suffering destruction or degradation of its structure, wherein the composition, after hardening, is able to be repaired, after having undergone damage, by subjecting the composition to a temperature above room temperature and to a mechanical constraint.