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Method used for optimizing epoxy carbon fiber composite material system interface performance

A composite material and interfacial performance technology, which is applied in the field of composite material toughening, can solve the problems of high melt viscosity of thermoplastic materials, low interface bonding strength between thermoplastic materials and carbon fibers, and low performance of composite materials such as compression and interlayer shear. Achieve the effect of improving the interface binding performance and expanding the application

Inactive Publication Date: 2019-06-18
HENGSHEN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of technology, the application of carbon fiber composite materials in the aerospace field continues to expand, from the secondary load-bearing structural parts to the main load-bearing structural parts. High requirements, at present, the method of interlayer toughening is mainly used to improve its strength. One of the methods is to distribute the thermoplastic between the layers of the composite material in the form of powder, film or non-woven fabric. This method can effectively However, due to the high melt viscosity of thermoplastic materials, it is difficult to fully infiltrate with carbon fibers, etc., resulting in low interface bonding strength between thermoplastic materials and carbon fibers, which in turn leads to low compression and interlayer shear properties of composite materials.

Method used

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  • Method used for optimizing epoxy carbon fiber composite material system interface performance
  • Method used for optimizing epoxy carbon fiber composite material system interface performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Comparison: T300 carbon fiber fabric is used, with an areal density of 160g / ㎡; the resin matrix is ​​a medium-temperature curing liquid epoxy (the main epoxy resin component is E-51). A layer of 6g / ㎡ polyester non-woven fabric is used for toughening, and its properties are shown in Table 1 below;

[0034] Improvement: On the basis of the comparison system, an interface improvement layer is added between the polyester non-woven fabric and the carbon fiber fabric. The density of this layer is 8g / ㎡, and its composition is: 80% E-51 epoxy, 18% CTBN, 0.5 %CNT and 1.5% ethylene vinyl acetate grafted maleic anhydride. Its performance is shown in Table 1 below:

[0035] Table 1 Performance comparison

[0036]

[0037] After the improvement, the compression and interlaminar shear properties of the material system are improved to a certain extent, while the compression properties after impact are basically unchanged.

Embodiment 2

[0039] Comparison: T800 carbon fiber fabric is used with an areal density of 190g / ㎡; the resin matrix is ​​a high temperature curing liquid epoxy (the main epoxy resin component is AG-80). A layer of 6g / ㎡ polyamide non-woven fabric is used for toughening, and its properties are shown in Table 2 below;

[0040] Improvement: On the basis of the comparison system, an interface improvement layer is added between the polyamide non-woven fabric and the carbon fiber fabric. The density of this layer is 14g / ㎡, and its composition is: 55% AG-80 epoxy resin, 40% polyether Sulfone, 1% CNT and 4% SMA. Its performance is shown in Table 2 below:

[0041] Table 2 Performance comparison

[0042]

[0043] After the improvement, the compression, interlaminar shear and post-impact compression properties of the material system are improved to a certain extent.

[0044] Beneficial effects of this embodiment: the problem of poor compression and interlaminar shear properties caused by weak int...

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Abstract

The invention provides a method used for optimizing epoxy carbon fiber composite material system interface performance. The method is capable of solving problems in the prior art that in moulding of aepoxy carbon fiber composite material system from an intercalation thermoplastic material toughening liquid, interface combination is weak, and compression and interlayer shearing performance are poor. According to the method, an epoxy resin film is adopted between a thermoplastic material and carbon fiber; the epoxy resin film is composed of three components including a matrix resin component, atoughening compound, and an interface modifying component. The original thermoplastic material and carbon fiber interface is changed to be a thermoplastic material-resin film-carbon fiber interface,so that an intercalation thermoplastic material toughened epoxy carbon fiber composite material system is adopted, and reduction interface performance is avoided at the same time.

Description

technical field [0001] The invention relates to the field of toughening of composite materials, in particular to the field of using "intercalation" thermoplastic materials to toughen liquid molding epoxy carbon fiber composite material systems, and in particular to a method for optimizing the interface properties of epoxy carbon fiber composite material systems . Background technique [0002] Carbon fiber is the main reinforcing fiber material for the manufacture of high-performance composite materials, and its reinforced resin matrix composites have been widely used in the aerospace field. With the development of technology, the application of carbon fiber composite materials in the aerospace field continues to expand, from the secondary load-bearing structural parts to the main load-bearing structural parts. High requirements, currently mainly adopt the method of interlayer toughening to improve its popularity. One of the methods is to distribute the thermoplastic between...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B27/12B32B27/20B32B27/38B32B27/08B32B33/00
Inventor 黄登亮单瑞俊周慧慧吕伟
Owner HENGSHEN
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