OPEN MOLD PROCESS FOR A FIBER-REINFORCED SEMI-CRYSTALLINE POLYAMIDE MATRIX COMPOSITE MATERIAL FROM PREPOLYMER REACTIVE PRECURSOR COMPOSITION

摘要

The present invention relates to a method of manufacturing in an open mold a thermoplastic composite material with fiber reinforcement and a matrix which is a semi-crystalline polyamide with a Tg of at least 80 ° C. and a Tf of less than or equal to 280 ° C. greater than 200 ° C., prepared in situ by melt mass polymerization by polycondensation, of a reactive precursor composition comprising, according to A, at least one first polyamide prepolymer A1 carrying two identical functions X or Y and at least one second polyamide prepolymer A2 carrying two identical functions X or Y, different from those of A1 and coreactive with respect to those of A1 or a precursor composition comprising, according to B, at least one carrier prepolymer (on the same chain) of two different functions X and Y coreactive between them or a precursor composition according to the mixture of (A + B) with X and Y being respectively carboxy or amine and conversely with said process comprising the successive steps of i) preparing reactive mixture A: (A1 + A2) or reactive mixture (A + B): (A1 + A2 + B) or melting said prepolymer according to B, ii) coating continuously by deposition-impregnation of said fibers, by said reactive precursor composition, iii) in-situ polymerization by mass melt polycondensation in an open heating die, iv) cooling of said material and with said final polyamide of said matrix and said prepolymers A1, A2 or B having the same specific composition in amide units. The invention also covers the reactive precursor composition, the resulting composite material, their use and end-articles.