Forming process of fiber reinforced thermoplastic composite material

Abstract

The invention discloses a low-cost high-efficiency forming process of a fiber reinforced thermoplastic composite material, comprising the following steps of: arranging a workpiece to be formed, which is prepared by laying fiber reinforced materials, in a closed space containing a mold template; laying demolding cloth and a diversion grid in sequence on the workpiece; laying or coating a demolding material under the workpiece; arranging an impregnating pipe on one side of the width direction of the workpiece; arranging a vacuum pipeline on the other side along the length direction of the workpiece and parallel to the side surface; arranging a breathable material between the vacuum pipeline and the workpiece; then pumping vacuum in the closed space through the vacuum pipeline, simultaneously raising the temperature of the mold template to the impregnating temperature of 50-250 DEG C; and finally filling molten thermoplastic resin or the precursor of the thermoplastic resin of which the temperature is 50-250 DEG C and the viscosity is 0.15-1.0Pa.s into the workpiece from the impregnating pipe, and then insulating for polymerization or reducing the temperature for cooling and forming. The forming process needs not to prepare a pre-impregnated belt in advance and has low cost and high efficiency, and the workpiece can be formed easily and has superior toughness and damage tolerance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a molding process method of fiber-reinforced thermoplastic composite materials. Background technique [0002] Compared with thermosetting resin-based composites, thermoplastic resin-based composites have excellent toughness and damage tolerance, good environmental resistance and flame retardancy, low volatile matter under vacuum conditions, low heat release rate, short molding cycle, and It has the advantages of multiple forming and continuous repairing. Thermoplastic resin-based composite materials have very attractive development prospects, and can be applied to occasions where the use environment is relatively harsh and the load-bearing capacity is required. [0003] At present, more than 20 molding processes of fiber reinforced thermoplastic resin matrix composites have been developed. Compression molding process, etc. Among all kinds of molding processes, exce...

AI Technical Summary

Problems solved by technology

Among all kinds of molding processes, except for the highly mechanized molding processes such as pultrusion and winding, there is a problem of preparation and laying of thermoplastic prepreg tapes. The preparation of thermoplastic prepreg tapes not only requires special equipment, but also requires a lot In addition, thermoplastic prepreg tapes are different from thermosetting prepreg tapes. Thermoplastic prepreg tapes do not have self-adhesiveness, and well-impregnated prepreg tapes usually have high rigidity. The laying process of the dipping tape increases the great technical difficulty

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