Method for toughening composite interlayers by using multiwalled carbon nanotubes

A technology of multi-walled carbon nanotubes and toughened composite materials, which is applied in the field of preparation of multi-walled carbon nanotubes for interlayer toughening of resin-based continuous fiber composite materials, can solve the problems of high cost, changing the stiffness of prepreg layers and Strength, unused and other issues, to achieve the best effect of fracture toughness, precise controllable spraying density, and enhanced fracture toughness

Inactive Publication Date: 2019-08-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method obtains better interlayer performance, but the process is still relatively complicated, and at the same time, dissolving nanomaterials in resin will change the stiffness and strength in the prepreg layer; and only G is tested in this application IC , not documented for other materials such as G IIC detection
[0004] Chinese patent (CN104945852A) discloses a micro-nanoparticle interlayer toughening technology. First, the mixed solution of micronanoparticles and inorganic particles is evenly sprayed on the fi...

Method used

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  • Method for toughening composite interlayers by using multiwalled carbon nanotubes
  • Method for toughening composite interlayers by using multiwalled carbon nanotubes
  • Method for toughening composite interlayers by using multiwalled carbon nanotubes

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Embodiment 1

[0025] Multi-walled carbon nanotubes toughened T700 (produced by Toray Corporation of Japan) epoxy resin composite material, specifically comprising the following steps: (1) selecting lower-cost and easier-to-obtain multi-walled carbon nanotubes as the laminated structure layer of the composite material The toughened material between multi-walled carbon nanotubes has an inner diameter of 3-5nm, an outer diameter of 8-15nm and a length range of 3-12μm, and its purity is more than 95wt%, and 0.5g is weighed on a high-precision mass scale; (2) Use the "ultrasonic dispersion method" to fully vibrate and disperse the multi-walled carbon nanotubes in ethanol or acetone, the vibration time is 10-15 minutes, and the temperature is 20°C; (3) After the epoxy resin composite material prepreg is cut , the prepreg surface area is 0.5m 2 , use an air gun with an air source to evenly spray the acetone or ethanol solution dispersed with multi-walled carbon nanotubes on the surface between the...

Embodiment 2

[0027] Multi-walled carbon nanotubes toughened T700 (produced by Toray Corporation of Japan) epoxy resin composite material, which specifically includes the following steps: (1) select lower-cost and easier-to-obtain multi-walled carbon nanotubes as the laminated structure of the composite material The interlayer toughened material has an inner diameter of 3-5nm, an outer diameter of 8-15nm and a length range of 3-12μm, and its purity is more than 95wt%, and 0.2g is weighed on a high-precision mass scale; (2 )Using the "ultrasonic dispersion method" to fully vibrate and disperse the multi-walled carbon nanotubes in ethanol or acetone, the vibration time is 10-15 minutes, and the temperature is 20°C; (3) The epoxy resin composite material prepreg is cut and completed After that, the prepreg surface area is 0.2m 2， Use an air gun with an air source to evenly spray the acetone or ethanol solution dispersed with multi-walled carbon nanotubes on the surface between the layers of th...

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Abstract

The invention belongs to the fields of preparation and mechanical properties of carbon fiber/resin-based laminated composite materials, and relates to a method for toughening composite interlayers byusing multiwalled carbon nanotubes (MWCNTs). The method comprises the steps that the multiwalled carbon nanotubes low in cost are used as a toughening material for the composite prepreg interlayers, after cutting of prepreg is completed, the multiwalled carbon nanotubes are quantitatively put into acetone or ethyl alcohol liquid in proportion, fully dispersed through ultrasonic waves and uniformlysprayed to the surface of each layer of the prepreg by using an air pressure gun, after the acetone or the ethyl alcohol is completely volatilized, the prepreg is laid and then fed into a hot-press tank for heating and pressurizing solidification, and finally, the prepreg is cut into DCB and ENF standard samples for I and II fracture toughness testing. The testing results show that when the spraying surface density is 1 g/m<2>, GIC and GIIC of the material are remarkably improved, the interlayer toughness of a composite laminated structure is improved, and the deficiency of the interlayer performance of the laminated composite material is made up for.

Description

technical field [0001] The invention belongs to the technical preparation field of thermosetting carbon fiber / resin-based composite materials, in particular to a method for preparing multi-walled carbon nanotubes (MWCNTs) for interlayer toughening of resin-based continuous fiber composite materials. Background technique [0002] At present, resin-based continuous fiber composite materials are widely used in the aviation field, and have the advantages of high specific stiffness and specific strength, fatigue resistance, and corrosion resistance. For example, the structural dosage of Boeing 787 reaches more than 50%. Resin-based continuous fiber prepreg composites are used as materials for the surface structure of aircraft. They are prone to delamination when they are impacted, which greatly reduces the load-bearing capacity of the structure used. Therefore, resin-based continuous fiber prepreg composites are toughened between layers. Improve its anti-delamination ability. ...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K3/04C08K7/06
CPCC08K7/06C08K2201/011C08K3/041C08L63/00
Inventor 刘斌高弄玥曹双辉汤博森许安琪
Owner NORTHWESTERN POLYTECHNICAL UNIV
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