Preparation method of ultrafine fibrous membrane-toughened prepreg of thermoplastic resin

A technology of thermoplastic resin and ultrafine fiber, which is applied in the field of prepreg preparation of composite materials, can solve the problems of affecting the process performance of composite materials, cumbersome process, poor paving performance, etc. good performance effect

Active Publication Date: 2014-02-05
AVIC COMPOSITES
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AI Technical Summary

Problems solved by technology

Interlayer toughening technology can greatly improve the toughness of composite materials. The key lies in the selection of interlayer toughening materials. With the advancement of technology, various forms of interlayer toughening materials have been developed. Tough materials are the most widely used, but there are still many problems in the form of interlayer toughening of film structures, such as thermoplastic films will limit the removal of air bubbles during composite molding, and the redistribution of resin between layers.
Moreover, the traditional interlayer toughening method is to use the toughening material as an independent individual, and insert it into the reinforcing material layer by manual laying and other methods. The process is cumbersome and the efficiency is low, and the toughening material is mainly thermoplastic resin. Composition, paveability is poor, which seriously affects the process performance in the process of composite material preparation

Method used

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  • Preparation method of ultrafine fibrous membrane-toughened prepreg of thermoplastic resin

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preparation example Construction

[0024] A preparation method of a thermoplastic resin superfine fiber film toughened composite material prepreg, the specific steps are as follows:

[0025] (1) Select a thermoplastic resin as a toughening agent, slice or crush the thermoplastic resin, then place it in a drying oven, and dry it at 80-100°C for 1-2 hours to remove the moisture therein;

[0026] (2) adding a good solvent to the dried thermoplastic resin to prepare a thermoplastic resin solution;

[0027] (3) Spray the thermoplastic resin solution on the surface of the reinforcing fiber fabric 1 by electrospinning to form a thermoplastic resin superfine fiber toughening layer 2 with random distribution and uniform surface density;

[0028] (4) The reinforced fiber fabric 1 with the superfine fiber toughening layer 2 loaded on the surface is hot-pressed by a hot roll to make the toughening layer 2 and the fiber fabric 1 form a whole, that is, the toughened fabric;

[0029] (5) The reinforced fiber fabric 1 loaded ...

Embodiment 1

[0033] Polyamide PA6 is selected as the toughening agent, the PA6 resin is sliced ​​or crushed, then placed in a drying oven, dried at 100°C for 2 hours, and after removing the moisture, the PA6 pellets are dissolved in formic acid. The dissolved resin solution is added to the electrospinning equipment, and the PA6 resin is sprayed on the surface of the carbon fiber unidirectional fabric U3160 by the electrospinning method to form a thermoplastic resin fiber toughening layer with random distribution and uniform surface density; the surface is loaded The U3160 carbon fiber fabric with the ultrafine PA6 fiber toughening layer is hot-pressed by a hot roll at 80°C so that the PA6 ultrafine fiber toughening layer and the U3160 reinforced fiber fabric form a whole, and the toughened carbon fiber unidirectional fabric is dried in an oven. After the solvent in the toughening layer is completely evaporated, the U3160 toughened fiber fabric is combined with the epoxy resin-based prepreg ...

Embodiment 2

[0035]Polyethersulfone PES is selected as the toughening agent, the PES resin is sliced ​​or crushed, then placed in a drying oven, dried at 100°C for 2 hours, and the water is removed, and the PES pellets are dissolved in DMF solvent. The dissolved resin solution is added to the electrospinning equipment, and the PES resin is sprayed on the surface of T700 carbon fiber unidirectional fabric U7192 by electrospinning method to form a thermoplastic resin fiber toughening layer with random distribution and uniform surface density; The U7192 carbon fiber fabric loaded with the ultrafine PES fiber toughening layer is hot-pressed by a hot roller at 150°C to form a whole with the PES ultrafine fiber toughening layer and the U7192 reinforced fiber fabric, and the toughened carbon fiber unidirectional fabric is dried in an oven. After the solvent in the toughening layer is completely volatilized, the U7192 toughened fiber fabric is combined with the Shuangma resin-based prepreg film, an...

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Abstract

The invention belongs to the field of preparation of composite materials, and relates to a preparation method of ultrafine fibrous membrane-toughened prepreg of thermoplastic resin with a toughening function. The method comprises the following steps: electrostatically spinning a toughening agent of thermoplastic resin to obtain ultrafine fibers of the thermoplastic resin with diameter of 100-5000nm, and directly spraying the fibers on the surface of a reinforced fiber fabric so as to form a toughening layer consisting of thermoplastic resin fibers which are distributed irregularly and are uniform in surface density on the surface of the fiber fabric; attaching the toughening layer with the fiber fabric to form a whole through a hot rolling process; and then, compounding the fiber fabric product with the toughening function and a prepreg resin base body to prepare the ultrafine fibrous membrane-toughened prepreg product of thermoplastic resin. The preparation method provided by the invention is simple in technical process and easy to implement, and can realize continuous production of high toughness prepreg, thereby greatly improving the production efficiency.

Description

technical field [0001] The invention belongs to the field of composite material prepreg preparation, and relates to a prepreg preparation method toughened by a thermoplastic resin superfine fiber film with a toughening function. Background technique [0002] Fiber-reinforced resin-based composites have become the first choice after aluminum alloys, steels, and titanium alloys due to their high specific strength, high specific stiffness, good fatigue fracture resistance, strong structural designability, and superior environmental resistance. Four major aerospace structural materials. In the aviation industry, composite materials, especially carbon fiber composite materials, have long been used in large quantities for secondary load-bearing parts, and are currently occupying an increasing proportion in main load-bearing parts such as wings and fuselages of aircraft. The general defect of this kind of material is low toughness, which is manifested as poor resistance to low-vel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/12B32B27/02B32B27/34B32B27/38B32B37/02
Inventor 张代军钟翔屿李晔张尧州陈祥宝王德辉
Owner AVIC COMPOSITES
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