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

A technology of reinforced thermoplastic and composite materials, which is applied in the field of material preparation, can solve the problems that it is difficult to meet the requirements of complete impregnation of reinforced fibers, the inability to form solid bars, and weak bonding strength, so as to avoid the problem of fiber delamination and realize mechanization and Automated, strength-boosting effects

Active Publication Date: 2014-05-28
AEROSPACE PRECISION PROD INC LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 mat

Method used

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

Examples

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Embodiment 1

[0032] The invention adopts the method of pre-weaving and then heating and molding to prepare continuous fiber reinforced thermoplastic resin composite solid rods. hereby attached figure 2 The process technology of the present invention is illustrated by taking mold preparation of continuous carbon fiber reinforced polyether ether ketone resin-based composite semi-cylindrical solid rod as an example. First, use a braiding machine to weave and wrap several polyether ether ketone monofilaments (determined according to the ratio of reinforcing fiber to resin matrix, such as 16) with a diameter of 0.1-0.2mm (such as 0.15mm) in a bundle of continuous carbon fibers (such as carbon fiber with a specification of 3K) to form composite filaments on the surface, cut the composite filaments into required lengths (the same as the length of the cavity of the female mold, such as 40mm), and cut several strands (according to the diameter of the final prepared rod) Make sure, such as 23 piec...

Embodiment 2

[0034] Several (such as 8) nylon 6 monofilaments with a diameter of 0.1-0.2mm (such as 0.18mm) are evenly woven and wrapped on the surface of a bundle of continuous aramid fibers (such as aramid fibers with a specification of 600dtex) to make a composite filament. Cut the composite wire into the same length (such as 80mm) of the cavity of the female mold 5, put several (such as 23) wire segments into the cavity of the female mold 5, close the male mold 4, and install it Place the mold in the heating device and heat it to 25-40°C above the melting point of nylon 6 (30°C is the best) and keep it warm for 10-15 minutes. The male mold 4 is pressed into the female mold 5 until it is molded to the required size, and the pressure is maintained for 5 to 10 minutes, then cooled and demoulded, and the continuous aramid fiber reinforced nylon 6 resin-based composite material of the required size (such as a length of 80mm) is obtained. bar.

Embodiment 3

[0036] Several (such as 32) polyphenylene sulfide monofilaments with a diameter of 0.1 to 0.2mm (such as 0.16mm) are evenly woven and wrapped on the surface of a bundle of glass fibers (such as glass fibers with a specification of 600tex) to make composite filaments. Cut the composite wire into the same length (eg 100mm) as the cavity of the female mold 5, put several (eg 16) wire segments into the cavity of the female mold 5, close the male mold 4, and place the installed The mold is heated in a heating device, heated to 25-40°C above the melting point of polyphenylene sulfide (30°C is the best) and kept for 10-15 minutes, and then press head 3 with a pressure of 1.2-2.4T (such as 1.8T). Forcefully press the male mold 4 into the female mold 5 until the molding reaches the required size, hold the pressure for 5 to 10 minutes, and then cool and demould to obtain a continuous glass fiber reinforced polyphenylene sulfide resin matrix with the required size (such as a length of 100...

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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...

Claims

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Application Information

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IPC IPC(8): B29C70/48B29C70/54
CPCB29C70/48B29C70/54
Inventor 焦莎赵国盟何建平张晓玲于建政郑晓冬
Owner AEROSPACE PRECISION PROD INC LTD
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