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Method for preparing carbon nano tube reinforced epoxy resin self repairing microcapsule

A technology of self-repairing microcapsules and carbon nanotubes, applied in the fields of national defense and organic composite materials, to achieve the effect of improving performance, easy operation and control, and enhanced effect

Inactive Publication Date: 2011-11-16
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no reports on the composite of carbon nanotubes and epoxy resin as a repairing agent for self-repairing microcapsules.

Method used

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  • Method for preparing carbon nano tube reinforced epoxy resin self repairing microcapsule
  • Method for preparing carbon nano tube reinforced epoxy resin self repairing microcapsule
  • Method for preparing carbon nano tube reinforced epoxy resin self repairing microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1, acidification of carbon nanotubes

[0018] Pure sulfuric acid and pure nitric acid were prepared into 240ml mixed strong acid at a volume ratio of 3:1, and 1g of carbon nanotubes were added to the mixed strong acid, dispersed in an ultrasonic (150W) water bath (65°C) for 6 hours, and left to stand for 5 hours. Extract the acidified carbon nanotubes, add deionized water to centrifuge and precipitate repeatedly, remove the acid remaining in the solution until the solution is basically neutral, and dry to remove water.

[0019] Step 2, preparation of epoxy resin-carbon nanotube emulsion

[0020] Mix Tween 20 and Span 60 at a mass ratio of 3:7 to form a compound emulsifier; mix 9g of epoxy resin with 1g of compound emulsifier, heat and stir in a water bath at 50°C, and the stirring speed is 3000rpm, slowly Add 30ml of deionized water dropwise to the mixture to form an epoxy resin emulsion after a certain period of time; add 0.001g of carbon nanotubes to the epoxy e...

Embodiment 2

[0026] Step 1. Acidification of carbon nanotubes

[0027] Pure sulfuric acid and pure nitric acid were prepared into 240ml mixed strong acid at a volume ratio of 3:1, and 1g of carbon nanotubes were added to the mixed strong acid, dispersed in an ultrasonic (150W) water bath (65°C) for 6 hours, and left to stand for 5 hours. Extract the acidified carbon nanotubes, add deionized water to centrifuge and precipitate repeatedly, remove the acid remaining in the solution until the solution is basically neutral, and dry to remove water.

[0028] Step 2, preparation of epoxy resin-carbon nanotube emulsion

[0029] Mix Tween 20 and Span 60 uniformly at a mass ratio of 3:7 to form a compound emulsifier; mix 8.8g of epoxy resin with 1.2g of compound emulsifier, heat and stir in a water bath at 60°C, and the stirring speed is 2000rpm , slowly add 30ml of deionized water to the mixture, and form an epoxy resin emulsion after a certain period of time; add 0.004g of carbon nanotubes to the...

Embodiment 3

[0035] Step 1. Acidification of carbon nanotubes

[0036] Pure sulfuric acid and pure nitric acid were prepared into 240ml mixed strong acid at a volume ratio of 3:1, and 1g of carbon nanotubes were added to the mixed strong acid, dispersed in an ultrasonic (150W) water bath (65°C) for 6 hours, and left to stand for 5 hours. Extract the acidified carbon nanotubes, add deionized water to centrifuge and precipitate repeatedly, remove the acid remaining in the solution until the solution is basically neutral, and dry to remove water.

[0037] Step 2, preparation of epoxy resin-carbon nanotube emulsion

[0038]Mix Tween 20 and Span 60 uniformly at a mass ratio of 3:7 to form a compound emulsifier; mix 8.75g of epoxy resin with 1.25g of compound emulsifier, heat and stir in a water bath at 60°C, and the stirring speed is 2000rpm , slowly add deionized water to the mixture to form an epoxy resin emulsion after a certain period of time; add 0.005g of carbon nanotubes to the epoxy em...

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Abstract

The invention provides a method for preparing a self repairing microcapsule by compounding epoxy resins and carbon nano tubes as a capsule core repairing agent, belonging to the field of organic composite materials. The method comprises the following steps of: preparing the epoxy resins into an epoxy emulsion with a compound surfactant by adopting a phase inversion method; adding carbon nano tubes in different mass fractions, stirring the emulsion and carrying out ultrasonic dispersion to obtain fine emulsion in which the carbon nano tubes and the epoxy resins are uniformly mixed; heating melamine and methyl aldehyde in a water bath kettle at the temperature of 60-80 DEG C to generate a capsule wall prepolymer solution; and mixing the epoxy-carbon nano tube emulsion and the melamine-methyl aldehyde prepolymer solution, and regulating to obtain an acid environment, thus the prepolymer further reacts to generate a capsule wall. The prepared micro capsules are uniform in particle size and are better distributed, and the contained carbon nano tubes can further enhance the repairing effect of the microcapsules and improve mechanical property.

Description

technical field [0001] The invention belongs to the field of organic composite materials, and in particular relates to a preparation method of carbon nanotube-reinforced epoxy resin self-repairing microcapsules, which is applied to the fields of national defense such as aviation and aerospace. Background technique [0002] During the long-term use of composite materials, affected by external temperature, pressure, temperature and other conditions, internal damage in the form of microcracks is prone to occur, resulting in a decrease in the mechanical properties of the material, changes in mechanical properties, and affecting the performance of the material. Once microcracks occur in a polymer material, the integrity of the material is severely compromised. In order to improve this situation, the self-healing function of the material is established by using the microcapsules coated with the repairing agent, so that the damage inside the material can be repaired to a certain ex...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 郑裕东田茹周章铭付小丽梁馨凌英谭珏吴健马衍轩
Owner UNIV OF SCI & TECH BEIJING
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