| 摘要 |
The present invention concerns a method for the open-mould production of a thermoplastic composite material with fibre reinforcement and a matrix that is a semi-crystalline polyamide with a Tg of at least 80°C and a Tf less than or equal to 280 °C and greater than 200 °C, prepared in-situ by bulk polymerisation in the molten state 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 of a precursor composition comprising, according to B, at least one prepolymer carrying (on the same chain) two different functions X and Y coreactive with each other; or of a precursor composition according to a mixture of (A + B), in which X and Y are respectively carboxy or amino and vice versa, wherin said method comprises the successive steps of i) preparing the reactive mixture A: (A1 + A2) or the reactive mixture (A + B): (A1 + A2 + B) or the melting of said prepolymer according to B, ii) continuously coating said fibres by deposition-impregnation with said reactive precursor composition, iii) in-situ bulk polymerisation by polycondensation in the molten state in an open heated die, iv) cooling said material, and said final polyamide of said matrix and said prepolymers A1, A2 or B having the same specific composition in terms of amide units. The invention also covers the reactive precursor composition, the composite material that results from same, the use thereof and final articles. |
