Formulated benzoxazine based system for transportation applications

摘要

The present disclosure provides a method of forming a flame retarded composite article using a halogen-free thermosetting composition comprising a benzoxazine compound, a monobenzoxazine monomer, and a naphthalene epoxy. The flame retarded composite article formed is especially suited for use in aerospace, automobile, rail and marine applications.

主权项

1. A method for producing a flame retarded composite article including the steps of: a) providing a layer or bundle of reinforcement fibers; b) providing a halogen-free thermosetting composition comprising:
(i) 15-30 parts by weight of a benzoxazine compound of the formula (I)wherein each R is, independently from one another, allyl, unsubstituted or substituted phenyl, unsubstituted or substituted C1-C8 alkyl or unsubstituted or substituted C3-C8 cycloalkyl,
(ii) a monobenzoxazine monomer of the formula (H)wherein X is monophenol, a C1-C8 alkyl group or a C3-C8 cycloalkyl group and
(iii) a naphthalene epoxywhere parts by weight are based on 100 parts by weight of the halogen-free thermosetting composition; c) contacting the reinforcement fibers with the halogen-free thermosetting composition to coat and/or impregnate the reinforcement fibers; and d) curing the coated and/or impregnated reinforcement fibers at a temperature of least about 80° C.