Core-shell nano fiber type self-healing carbon fiber composite material and preparation method thereof

A nanofiber and composite material technology, applied in carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of long curing time and poor healing effect, and achieve the effect of easy operation, improved interlayer performance, and stable process.

Active Publication Date: 2021-03-02
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, it is necessary to provide a core-shell nanofiber type self-healing carbon fiber composite material and its preparation method to solve the existing problems in the prior art Technical problems of long curing time and poor healing effect of self-healing composite materials

Method used

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  • Core-shell nano fiber type self-healing carbon fiber composite material and preparation method thereof
  • Core-shell nano fiber type self-healing carbon fiber composite material and preparation method thereof
  • Core-shell nano fiber type self-healing carbon fiber composite material and preparation method thereof

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preparation example Construction

[0018] see figure 1 , the first aspect of the present invention provides a method for preparing a core-shell nanofiber type self-healing carbon fiber composite material, comprising the following steps:

[0019] S1 uses coaxial electrospinning technology to prepare core-shell nanofiber A and core-shell nanofiber B respectively; wherein, the core layer material in core-shell nanofiber A is bisphenol A epoxy resin and bisphenol F epoxy resin One or two of them, which are healing agent resins, have a viscosity range of 500-5000mPa.s, preferably 500-2500mPa.s, and further 2500mPa.s. The flow in the crack, so that the healing agent quickly fills the damaged area and shortens the healing time; the core layer material in the core-shell nanofiber B is a highly active curing agent, which is conducive to improving the healing speed, specifically isophorone diamine, poly One or more of mercaptan, ethylenediamine, polyethylene polyamine, which is a curing agent curing agent; the shell mat...

Embodiment 1

[0036] Add the shell spinning solution with a mass fraction of 9wt% (N,N-dimethylformamide solution of acrylonitrile) into the outer needle barrel, and add bisphenol F epoxy resin (viscosity 2500mPa.s) into the inner needle Syringe; among them, the injection speed of the outer needle is set to 0.9ml / h, and the injection speed of the inner needle is set to 0.07ml / h; the positive pressure of the power supply is set to 13KV, and the negative pressure is set to -1KV; the temperature is 30°C, and the humidity is 50% ; After the electrospinning parameters are adjusted, fix the T700 carbon fiber unidirectional cloth on the roller collector, then start the electrospinning machine for spinning, the roller speed is set to 50rpm, and the distance from the needle to the roller is 15cm. At this time, the nanofiber Start to deposit on the surface of the carbon fiber unidirectional cloth, and the spinning time is 120min to obtain a carbon fiber fabric containing the core-shell nanofiber A;

...

Embodiment 2

[0040] Add the shell spinning solution (N,N-dimethylformamide solution of acrylonitrile) with a mass fraction of 20wt% into the outer needle barrel, and add bisphenol F epoxy resin (viscosity 1500mPa.s) into the inner needle Syringe; among them, the injection speed of the outer needle is set to 0.5ml / h, and the injection speed of the inner needle is set to 0.1ml / h; the positive pressure of the power supply is set to 13KV, and the negative pressure is set to -1KV; the temperature is 30°C, and the humidity is 50% ; After the electrospinning parameters are adjusted, fix the T700 carbon fiber unidirectional cloth on the roller collector, then start the electrospinning machine for spinning, the roller speed is set to 50rpm, and the distance from the needle to the roller is 15cm. At this time, the nanofiber Start to deposit on the surface of the carbon fiber unidirectional cloth, and the spinning time is 90min to obtain a carbon fiber fabric containing the core-shell nanofiber A;

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Abstract

The invention discloses a core-shell nano fiber type self-healing carbon fiber composite material and a preparation method thereof. The preparation method comprises the following steps of: separatelypreparing a core-shell nanofiber A and a core-shell nanofiber B by means of a coaxial electrospinning technique; attaching the two to the surface of the carbon fiber fabric; then paving the carbon fiber fabric containing the core-shell nanofiber A and the core-shell nanofiber B as a reinforcing material or paving a mixture of the carbon fiber fabric and a blank carbon fiber fabric as the reinforcing material; and infiltrating a resin to cure and form the self-healing carbon fiber composite material. When the composite material is damaged, a healing agent resin in the core-shell nanofiber A anda healing agent curing agent in the core-shell nanofiber B flow out and are blended to fill damage cracks to achieve quick curing to repair damage under thermal excitation, so that self-healing is achieved. By adopting the coaxial electrospinning technique, the method is stable in process and easy to operate and achieves industrial and large-scaled production favorably.

Description

technical field [0001] The invention relates to the technical fields of chemical engineering and functional materials, in particular to a core-shell nanofiber type self-healing carbon fiber composite material and a preparation method thereof. Background technique [0002] Carbon fiber composite materials have the advantages of diversified functions, simple molding process, strong plasticity in material structure and performance, and are widely used in the fields of automobile industry, shipbuilding industry, and aerospace industry. Although carbon fiber composites have many excellent properties, they are prone to microcracks or even delamination when subjected to external impact during production and use. In most cases, there is no obvious visual damage, but the existence of internal damage will cause the composite material The great loss of strength and stiffness is a hidden danger for the safe use of composite structures. [0003] Self-healing materials can repair the int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55D06M101/40
CPCD06M15/55D06M2101/40
Inventor 蔡浩鹏王洪伟陈博学
Owner WUHAN UNIV OF TECH
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