Molding method of continuous fiber reinforced thermoplastic resin-based composite material

Abstract

The invention provides a molding method of a continuous fiber reinforced thermoplastic resin-based composite material. The molding method comprises the following steps: weaving resin monofilaments and continuous fiber yarn tows to form composite yarns in advance, wherein a resin matrix wraps the surface of the continuous fiber yarn tows in the composite yarns; and next, heating and mold-pressing, wherein the resin matrix and continuous fibers are well immersed and combined during the heating and pressing process, the ratio of the continuous fibers in the composite material can be accurately controlled, and cavity types with different shapes can be designed for a mold so as to form solid bars with specific cross-section profiles. The molding method is applicable to molding of composite material products with relatively complex shapes, the products can be molded once, and thus the production efficiency is high; the continuous fibers are uniformly distributed in the composite material, so that the problem of apparent fiber layering is avoided and the intensity of the composite material products is greatly increased.

Description

technical field [0001] The invention relates to the technical field of material preparation, and relates to a molding method of composite materials. Background technique [0002] With the development of material science and technology, the preparation technology of composite materials has become one of the research hotspots in the world today. At present, domestic methods for preparing continuous fiber-reinforced thermoplastic resin-based composites include pultrusion, rolling, extrusion, powder molding, winding, etc. These methods have their own advantages and disadvantages, but these methods have common limitations. The formed composite material can only be a sheet, strip or pipe, and cannot be formed into a solid bar. [0003] Moreover, it is difficult for existing molding methods to meet the requirements of uniform distribution of reinforcing fibers and matrix resin and complete impregnation of reinforcing fibers with matrix resin. In the composite molding method provid...

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Problems solved by technology

At present, domestic methods for preparing continuous fiber-reinforced thermoplastic resin-based composites include pultrusion, rolling, extrusion, powder molding, winding, etc. These methods have their own advantages and disadvantages, but these methods have common limitations. Formed composite materials can only be sheets, strips or pipes, and cannot be formed into solid rods

[0003] Moreover, it is difficult for existing molding methods to meet the requirements of uniform distribution of reinforcing fibers and matrix resin and complete impregnation of reinforcing fibers with matrix resin. In the composite molding method provided by Chinese patent CN101259752, the fiber layer is placed in the mold cavity and then resin is added. The continuous fibers in the composite material obtained in this way are distributed in layers, and the bonding strength between the fiber layers is relatively weak, which makes the composite material easy to be peeled and damaged from the fiber layers under a certain load. greatly reduce its strength

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