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Molding method of continuous fiber reinforced thermoplastic resin sheet

A technology for reinforcing thermoplastic and thermoplastic resin, which is applied in the field of continuous fiber reinforced thermoplastic resin sheet molding, can solve the problems of single dipping equipment, reduced dipping effect and high polymer melt viscosity

Active Publication Date: 2014-06-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Molding method of continuous fiber reinforced thermoplastic resin sheet
  • Molding method of continuous fiber reinforced thermoplastic resin sheet
  • Molding method of continuous fiber reinforced thermoplastic resin sheet

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0025] Install the continuous carbon fiber T300 (manufactured by Toray Corporation, Japan) on the spindle of the creel, then wind the carbon fiber in a wave pattern and pass through the pre-dispersion device, while heating the carbon fiber at a preset temperature of 260°C; Eliminate static electricity due to friction, and then lead the carbon fiber to the wire inlet hole of the radiation melting impregnation device, and the carbon fiber entering the radiation melting impregnation device is also wound around the first tension roller in a wave pattern, and the carbon fiber is led to the second impregnation in the same way Finally, the carbon fiber is led out from the outlet of the secondary impregnation device, and then passes through the traction device and the winding device in turn.

[0026] After the arrangement of carbon fibers is completed, the twin-screw extruder is turned on, and the thermoplastic resin melt is pressed into the radiation melting impregnation mold. The set...

specific Embodiment 2

[0028] The continuous glass fiber (Zhejiang Jushi Group) is installed on the spindle of the creel, and then the glass fiber is wound through the pre-dispersion device according to the wave shape, and the glass fiber is heated at the same time, the preset temperature is 230 ℃; after that, it is passed through the static elimination device Eliminate the static electricity caused by friction, and then guide the glass fiber to the wire inlet hole of the radiation melting and impregnation device, and the glass fiber entering the radiation melting and impregnation device is also wound around the tension roller in a wave pattern, and the glass fiber is guided to the secondary in the same way. The impregnating device finally guides the glass fiber from the outlet of the secondary impregnating device, and passes through the traction device and the winding device in turn.

[0029] After the arrangement of the glass fibers is completed, the twin-screw extruder is turned on, and the thermo...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/52B29C70/54
CPCB29C70/523B29C70/528
Inventor 贾明印薛平陈同海
Owner BEIJING UNIV OF CHEM TECH
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