PROCESS FOR A FIBER-REINFORCED POLYAMIDE MATRIX COMPOSITE MATERIAL FROM REACTIVE PRE-CEMENTITIOUS PRECURSOR COMPOSITION

摘要

The present invention relates to a method of manufacturing a thermoplastic composite material with fibrous reinforcement and a matrix which is a semi-crystalline polyamide of Tg of at least 80 ° C and Tf less than or equal to 280 ° C and greater than 200. C., prepared in situ by melt 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 compared 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 with one another or a precursor composition according to a mixture of (A + B) with X and Y being respectively carboxy or amine and conversely with said process comprising the successive steps of i) preparation of the reaction mixture A: (A1 + A2) or of the reaction mixture (A + B): (A1 + A2 + B) or of the melting of said prepolymer according to B, ii) impregnation of said fibers, by injection in the molten state of said reactive precursor composition, iii) in-situ polymerization by mass melt polycondensation, iv) cooling and demolding 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 part and its use.