Directional silk distribution short carbon fiber thermoplastic resin based prepreg preparation device and method

Abstract

The invention discloses a directional silk distribution short carbon fiber thermoplastic resin based prepreg preparation device and method and belongs to the field of composite material preparation. By utilizing the special structure of a vibration sieve, through the restriction effect of vibration sieve holes, carbon fiber silks which fall off through vibration from slender sieve holes to performvertical motion of a free falling body; when one ends of the fiber silks are adhered to a resin film in the falling process, the carbon fiber silks are reversely fixed by utilizing the viscosity of the resin film and one-way relative motion of the carbon fiber silks and a two-dimensional movement platform, directional arrangement and uniform distribution of carbon fibers in a movement direction are realized, and the problems of uneven distribution and difficulty in orientation of short carbon fibers in thermoplastic resin are well solved; and through control on a movement speed of the two-dimensional movement platform and control on number of times of laying, accurate control on the content of the carbon fibers in a prepreg is realized, orientation of the carbon fiber silks can be an arbitrary two-dimensional direction, crossing distribution of multiple layers of resin films and multiple layers of carbon fibers is realized, and the mechanical performance of a carbon fiber composite material is improved.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and relates to a device and method for preparing chopped carbon fiber-reinforced thermoplastic resin-based prepregs with directional cloth, and is especially suitable for thermoplastic resins in which chopped carbon fibers are difficult to uniformly disperse and have high melt viscosity Preparation of prepregs for chopped fiber-reinforced composites. Background technique [0002] Carbon fiber is a new type of fiber material with excellent characteristics such as high specific strength and specific stiffness, corrosion resistance, and high temperature resistance. A very important application form of carbon fiber is to use various thermoplastic or thermosetting resins as the matrix, and use chopped, long cut or continuous carbon fiber filaments as the reinforcing phase to prepare carbon fiber composite prepregs, which provide various carbon fiber composite components. intermediate mat...

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Problems solved by technology

Especially for thermoplastic chopped carbon fiber composite material prepreg, the existing preparation method is to directly mix chopped carbon fiber with resin powder and then use extrusion process to obtain the desired product. This method has the following problems: 1) Resin The melt viscosity is high, and it is difficult to fully impregnate the reinforcing fiber; 2) The fiber filaments are difficult to distribute evenly in the resin, and fiber filaments are prone to bending, winding and other undesirable phenomena, which not only affects the stability of the mechanical properties of the component, but also limits the fiber content 3) The orientation of the fiber filaments in the resin matrix is ​​generally randomly arranged, and it is difficult to control the orientation, so the prepared carbon fiber composite material prepreg shows isotropic characteristics, so that the mechanical properties of the composite material components can be designed. sexual inadequacy

[0003] Aiming at the problem of how to realize the alignment of fiber filaments in the preparation of chopped carbon fiber reinforced thermoplastic resin-based prepregs, the Chinese patent application number CN201710106058.8 discloses a method for realizing fiber orientation in carbon fiber prepregs. The powder and carbon fiber filaments are fully mixed first, and then the mixture is extruded by an extruder, and a magnetic field is added during the extrusion process to achieve fiber filament orientation; in this method, the orientation effect is not ideal due to the high melt viscosity of the thermoplastic resin

Chinese patent application number CN201611051977.1 discloses a method for preparing continuously oriented mats of chopped fibers. The fiber filaments and dispersant are put into a stirrer and stirred to a suspension, and the suspension is introduced into a tapered In this method, because the width of the tapered nozzle is 30mm, the falling of the fiber tends to fall in two states of horizontal and vertical, which makes the fiber orientation effect not good, and the whole process is complicated and cannot be Realize automated production

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