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Method for shaping and toughening fiber reinforced composite material

A composite material and fiber-reinforced technology, applied in the field of composite materials, can solve the problems of relatively stringent solubility requirements of thermoplastic resins, inability to penetrate fibers or adhesion and toughening effects, and small two-phase interface area, etc., to achieve high temperature resistance and increase Stiffness, the effect of meeting large-scale applications

Active Publication Date: 2012-06-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the traditional "in-situ" toughening method, the viscosity of the system becomes larger after the resin is added, and it cannot or is difficult to be used for RTM molding. The newly developed "off-situ" toughening technology (China CN101220561, CN101760965A) avoids this to a certain extent. The problem is that by adding a layer of toughening film during the molding process of the composite material, the multi-layered multi-phase toughened phase structure between the layers will not reduce other mechanical properties after curing and molding, and the compressed impact strength (CAI) of the composite material will be increased by 100. % or more, but the solubility requirements for thermoplastic resins are relatively strict. If thermoplastic resins have a certain solubility in thermosetting resins, it will lead to thickening, difficulty in flowing and uneven dispersion during the injection process.
For example, the patent No. WO9009410-A is to add dispersible particles into interlayer toughening, which is also closely related to this patent. However, after adding dispersible thermoplastic particles, the particle structure and morphology hardly change, and the original The morphology exists between the layers of the final composite material, which cannot penetrate or bond the fibers of the upper and lower layers to achieve a better toughening effect, and most of the particles are nearly spherical polyhedrons, and the area of ​​the two-phase interface formed is relatively small

Method used

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  • Method for shaping and toughening fiber reinforced composite material
  • Method for shaping and toughening fiber reinforced composite material
  • Method for shaping and toughening fiber reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Crush the polyimide foaming powder whose structural formula is as follows into a powder with a size of about 5 μm. The methanol content in the foaming powder is 10%, and it is evenly dispersed on the surface of the continuous carbon fiber fabric, and the surface density is 10 g / m 2 , the ambient temperature is room temperature; after passing through the heating zone at 180°C for 5s, the fabric with foam powder is obtained.

[0021]

[0022] (2) When the layup is finalized, place the prefabricated body obtained by the layup in an oven, heat it to 300°C and keep it for 1 hour by vacuum bag pressing, so that the polyimide foaming powder is fully imidized and developed. bubbles and form a thermoplastic polymer bridge structure for toughening between the layers.

Embodiment 2

[0024] (1) Pulverize the polyimide foaming powder whose structural formula is as follows into a powder with a size of about 20 μm. The ethanol content in the foaming powder is 30%, and it is evenly dispersed on the surface of the continuous carbon fiber fabric, and the surface density is 25g / m 2 , the ambient temperature is room temperature; after passing through a heating zone at 160°C for 15s, a fabric loaded with foam powder is obtained.

[0025]

[0026] (2) When the layer is finalized, put the prefabricated body obtained by the layer in an oven, adopt the method of vacuum bag pressure setting, heat to 280 ° C and keep it for 1.5 hours, so that the polyimide foaming powder is fully imidized. bubbles and form a thermoplastic polymer bridge structure for toughening between the layers.

Embodiment 3

[0028] (1) The polyimide foaming powder whose structural formula is shown below is pulverized into a powder with a size of about 40 μm. The solvent DMF content in the foaming powder is 15%, and it is evenly dispersed on the surface of the continuous carbon fiber fabric, and the surface density is 25g / m 2 , the ambient temperature is room temperature; after passing through a heating zone at 180°C for 30s, a fabric loaded with foam powder is obtained.

[0029]

[0030] (2) When the layup is finalized, place the prefabricated body obtained by the layup in an oven, heat it to 250°C and keep it for 2 hours by vacuum bag pressing, so that the polyimide foaming powder is fully imidized and developed. bubbles and form a thermoplastic polymer bridge structure for toughening between the layers.

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Abstract

The invention belongs to the technical field of composite material, and relates to a method for shaping and toughening a fiber reinforced composite material. In the invention, polyimide foam powder (such as poly tetracid diester diamide, polyimide foam precursor) are used for shaping and toughening a continuous fiber reinforced composite material; after the polyimide foam powder is uniformly dispersed on fiber fabric, the powder can be bonded onto the surface of the fabric when heated at a certain temperature; and when the powder is foamed at a higher temperature, the powder and the surface of the fabric can be mutually spliced, penetration bonding can be caused on fiber surface and a bridge structure is formed in situ, thus shaping and toughing effects are realized at the same time. The formed toughening bridge structure has the characteristics of high temperature tolerance and insolubility, and the problem of flowing difficulty in RTM (released to manufacturing) glue injection caused by overhigh viscosity is not caused.

Description

technical field [0001] The invention belongs to the field of composite materials and relates to a shaping and toughening method for fiber-reinforced composite materials. Background technique [0002] The interlaminar fracture toughness of laminated thermosetting resin matrix composites is mainly achieved by the toughening of the resin matrix, especially the interlaminar resin matrix. The toughness of materials is related to its chemical structure and microstructure. There are four toughening mechanisms used in the toughening of materials, namely: viscoelastic flow, microcracks and cracks, crack anchoring bridges, and crack deflection. The following methods have been applied to (1) chain extension and toughening of thermosetting resins or formation of interpenetrating network structures; (2) mixing rubber particles and thermoplastic resins to generate two phases or phase separations induced by chemical reactions. Multiphase structure toughening includes "in situ" and newly d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B11/00C08L79/08C08G73/10C08J9/00
Inventor 郭妙才崔海超刘刚益小苏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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