CN-111703092-B - Thermoplastic prepreg fabric structure, preparation method and preparation device thereof

Abstract

The invention discloses a thermoplastic prepreg fabric structure, a preparation method and a preparation device thereof, wherein the thermoplastic prepreg fabric comprises a first thermoplastic hot-melt porous net film, a middle plane yarn carbon fiber fabric and a second thermoplastic hot-melt porous net film which are sequentially overlapped, and the first thermoplastic hot-melt porous net film and the second thermoplastic hot-melt porous net film both comprise a carbon fiber fabric reinforced structure and a thermoplastic resin prepreg structure.

Inventors

• ZHANG MIN
• ZHU ANPING
• CAO WEIWEI
• WANG YONGWEI
• LIU YULAN
• ZHU BO

Assignees

• 山东宽原新材料科技有限公司
• 山东宽原新材料科技有限公司

Dates

Publication Date

20260421

Application Date

20200608

Priority Date

20200608

Claims (6)

1. 1. The preparation method of the thermoplastic prepreg fabric is characterized by comprising the following steps of: The first thermoplastic hot-melt porous net film, the middle plane yarn carbon fiber fabric and the second thermoplastic hot-melt porous net film which are sequentially overlapped are put into a vacuum impregnation device, and are vacuumized after being sealed, wherein the vacuum degree after reaching the standard is 0.06-0.1MPa; Injecting glue to the upper and lower surfaces of the reinforced fiber fabric simultaneously after the vacuum degree in the vacuum impregnation device reaches the standard, and carrying out vacuum impregnation and heating and melting treatment simultaneously, wherein the heating and melting temperature is 120-300 ℃, and the heating and melting time is 5-20min; pulling the treated prepreg fabric out of the vacuum impregnation device, and carrying out hot melting, pressurizing and impregnating on the prepreg fabric by an electric heating pair roller device to obtain a thermoplastic prepreg fabric; The temperature of the electric heating pair roller device for hot melting, pressurizing and impregnating is 120-300 ℃; the glue content of the thermoplastic prepreg fabric is 40-70%, and the percentage is mass percent; The pressure of the electric heating pair roller device for hot melting, pressurizing and impregnating is 1-5Mpa; The thermoplastic hot-melt porous net film is prepared by adopting superfine fiber melt spinning, and porous structures are arranged among fibers, so that the prepared net film is a porous net film, and the material of the presoaking structure in the thermoplastic presoaking fabric is any one of polyethylene, polypropylene, polybutylene terephthalate, polyamide, polyphenylene sulfide, polyetherimide, polyether ketone, polyether ether ketone and polyoxymethylene; When the material of the prepreg structure is polyethylene, the resin content of the injected glue is 20%; When the material of the prepreg structure is polyphenylene sulfide, the resin content of the injected glue is 20%; When the material of the prepreg structure is polybutylene terephthalate, the resin content of the injected glue is 25%; When the prepreg structure is made of polyamide, the resin content of the injected glue is 30%.
2. 2. A thermoplastic prepreg according to claim 1, wherein the electrically heated twin roll device has a rotational speed of from 2 to 10 m/min.
3. 3. The thermoplastic prepreg fabric of claim 1, wherein the yarns of the reinforcing fiber fabric are selected from one of the group consisting of T300, T700, T800, T1000 carbon fibers.
4. 4. A thermoplastic prepreg fabric according to claim 1, wherein the reinforcing fiber fabric has a structural form of one-way weave or any one of plain weave, twill weave, satin weave two-dimensional fabrics.
5. 5. The thermoplastic prepreg fabric of claim 1, wherein the gram weights of the thermoplastic prepreg fabric upper prepreg structure and the thermoplastic prepreg fabric lower prepreg structure are controlled to be 5-50 g/m 2 .
6. 6. The preparation device for preparing the thermoplastic prepreg fabric according to any one of claims 1 to 5 is characterized by comprising a semi-closed vacuum impregnation device and an electric heating pair roller, wherein the electric heating pair roller is arranged at the downstream of the semi-closed vacuum impregnation device; The semi-closed vacuum impregnation device is provided with a semi-closed impregnation chamber, a vacuumizing device and a glue injection device, wherein an inlet channel and an outlet channel are respectively arranged on two opposite sides of the semi-closed impregnation chamber, and end sealing devices are arranged at the inlet channel and the outlet channel; the vacuumizing device is communicated with the semi-closed dipping chamber; The glue injecting heads of the glue injecting device are arranged in the semi-closed impregnating cavity and are in an upper layer and a lower layer, the glue injecting heads are distributed on two sides of the fiber fabric channel, and the glue injecting directions of the glue injecting heads of the upper layer and the lower layer are opposite.

Description

Thermoplastic prepreg fabric structure, preparation method and preparation device thereof Technical Field The invention belongs to the technical field of preparation of prepreg fabrics, and particularly relates to a thermoplastic prepreg fabric structure, a preparation method and a preparation device thereof. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. The thermosetting carbon fiber composite material is a main product of the carbon fiber reinforced resin matrix composite material at present, and the excellent mechanical property and the low density characteristic of the thermosetting carbon fiber composite material enable the thermosetting carbon fiber composite material to become a substitute raw material with the most potential performance improvement of a metal structural component. However, the thermosetting resin has a macroscopic physical property of insolubility due to a special molecular crosslinked structure after curing, which also causes the problems of irrecoverability and inability of repeated molding processing of the composite material based on the thermosetting resin. In order to optimize the recyclable property of the carbon fiber composite material, the carbon fiber composite material using the thermoplastic resin as a matrix is currently the key direction of research on novel composite materials. However, thermoplastic resins have a relatively high hot melt viscosity, which directly results in very low melt flow, making direct impregnation difficult to prepare thermoplastic composites. Meanwhile, the solvent liquid phase treatment technology of the thermoplastic resin brings the technical problems that the solvent is difficult to remove, the thermoplastic composite material is easy to cause larger porosity and poor compactness, and the mechanical property of the product is poor. Disclosure of Invention In order to solve the technical problems in the prior art, the invention aims to provide a thermoplastic prepreg fabric structure, a preparation method and a preparation device thereof. To achieve the above object, one or more embodiments of the present invention disclose the following technical solutions: in a first aspect, a thermoplastic prepreg fabric is provided, which comprises a first thermoplastic hot-melt porous net film, a middle plane yarn carbon fiber fabric and a second thermoplastic hot-melt porous net film which are sequentially overlapped; the first thermoplastic hot-melt porous web film and the second thermoplastic hot-melt porous web film each comprise a carbon fiber fabric reinforced structure and a thermoplastic resin prepreg structure. In a second aspect, there is provided a method of preparing the thermoplastic prepreg fabric, comprising the steps of: Continuously feeding the reinforced fiber fabric into a vacuum impregnation device, sealing, and vacuumizing; when the vacuum degree in the vacuum impregnation device reaches the standard, simultaneously injecting glue to the upper surface and the lower surface of the reinforced fiber fabric, carrying out vacuum impregnation, and simultaneously carrying out heating and melting treatment; And (3) pulling the treated prepreg fabric out of the vacuum impregnation device, and carrying out hot melting, pressurizing and impregnating on the prepreg fabric by an electric heating pair roller device to obtain the thermoplastic prepreg fabric. In a third aspect, a preparation device of the thermoplastic prepreg fabric is provided, comprising a semi-closed vacuum impregnation device and an electric heating pair roller, wherein the electric heating pair roller is arranged at the downstream of the semi-closed vacuum impregnation device; The semi-closed vacuum impregnation device is provided with a semi-closed impregnation chamber, a vacuumizing device and a glue injection device, wherein an inlet channel and an outlet channel are respectively arranged on two opposite sides of the semi-closed impregnation chamber, and end sealing devices are arranged at the inlet channel and the outlet channel; the vacuumizing device is communicated with the semi-closed dipping chamber; The glue injecting heads of the glue injecting device are arranged in the semi-closed impregnating cavity and are in an upper layer and a lower layer, the glue injecting heads are distributed on two sides of the fiber fabric channel, and the glue injecting directions of the glue injecting heads of the upper layer and the lower layer are opposite. Compared with the prior art, the above technical scheme of the invention has the following beneficial effects: In the prepared prepreg fabric, the prepreg hot-melt resin can be uniformly distributed on the upper surface and the lower surface of the prepreg f