Molding method of continuous fiber reinforced thermoplastic resin sheet

Abstract

The invention discloses a molding method of a continuous fiber reinforced thermoplastic resin sheet. An apparatus for realizing the method comprises a pre-dispersion device, a static elimination device, an extruder, a radiation melt impregnation device, a secondary impregnation device, a traction device and a rolling device. The method comprises the following steps: introducing continuous fiber yarns to the pre-dispersion device from a yarn rack, and dispersing, heating and drying the fibers by the pre-dispersion device to make the temperature of the surface of the fibers reach a temperature between the melting temperature of a melt resin and the destroy temperature of a surface conditioning agent in order to well impregnate; and allowing the preheated fibers to go through the static elimination device, introducing the yarns into the radiation melt impregnation device fed by the extruder, impregnating fiber bundles under the action of a tension roll, and introducing the fiber bundles into the secondary impregnation device to realize secondary impregnation in order to realize a secondary impregnation effect. The method has a substantial higher fiber bundle impregnation effect than the prior art, and the matched molding apparatus has the advantages of simple structure and convenient operation.

Description

technical field [0001] The invention relates to the preparation of a composite material, in particular to a molding method of a continuous fiber reinforced thermoplastic resin sheet. Background technique [0002] Long-fiber-reinforced thermoplastics are lightweight, inexpensive, and easy to recycle and reuse, and have become one of the fastest-growing products in the thermoplastic market. It is not only widely used in aerospace and military fields, but also in the fields of energy transportation, information communication and building materials. [0003] So far, some impregnation equipment and impregnation methods for preparing continuous fiber-reinforced thermoplastic resins have been disclosed in China. The common characteristics of these molding methods are that the impregnation equipment is relatively simple and the auxiliary equipment is complicated. Under the shear rate, it has high viscosity and low pseudoplasticity, it is difficult to penetrate into the fibers of a...

AI Technical Summary

Problems solved by technology

[0003] So far, some impregnation equipment and impregnation methods for preparing continuous fiber-reinforced thermoplastic resins have been disclosed in China. The common characteristics of these molding methods are that the impregnation equipment is relatively simple and the auxiliary equipment is complicated. Under the shear rate, it has high viscosity and low pseudoplasticity, it is difficult to penetrate into the fibers of a few microns or more than ten microns, it is difficult to completely and uniformly impregnate the fiber bundles, and the viscosity of the polymer melt is high, the fiber Full impregnation requires high temperature, pressure and time

For example: in the Chinese invention patent with the publication number CN101856872A, the preheated continuous fiber strip is introduced into the staggered openable double-extrusion die set for pre-impregnation. This impregnation method is a wave-type impregnation. It can only be impregnated by relying on the tension of the fiber and the pressure of the molten resin ejected from the die or the force of the die pressing the fiber bundle. This process cannot ensure that the fiber bundle is fully impregnated; At this time, an extrusion die is equivalent to a flow channel, which greatly limits the degree of impregnation, thereby greatly reducing the impregnation effect

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