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Double-capsule self-repairing epoxy coating and preparation method thereof

An epoxy coating, self-healing technology, used in microcapsule preparations, microsphere preparation and other directions, can solve the problems of low encapsulation efficiency, inability to provide sufficient structural stability, emulsion droplet fusion, demulsification, etc., to improve the encapsulation efficiency. volume, improve repair efficiency, and prevent the effect of milk droplet fusion

Inactive Publication Date: 2016-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most traditional methods use emulsifier-stabilized emulsions to prepare microcapsules, but such emulsifier-stabilized emulsions often cannot provide sufficient structural stability to prevent the emulsion droplets in the emulsion from merging, and even cause demulsification, resulting in encapsulation low efficiency

Method used

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  • Double-capsule self-repairing epoxy coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 1 g of polyvinyl alcohol (polymerization degree: 2600) to 100 mL of deionized water, and stir magnetically at 80 °C for 12 h to obtain an aqueous solution of polyvinyl alcohol. Add 30 mg of silica nanoparticles to 6 mL of polyvinyl alcohol aqueous solution for ultrasonic dispersion for 1 min, add 3 g of epoxy resin, mix the oil and water phases, and emulsify at 9000 rpm high-speed shearing to obtain an oil-in-water skin stabilized by silica nanoparticles Pickering emulsion; then add 300 ml of isophorone diisocyanate to the Pickering emulsion, and mix well to obtain a mixed solution. Dissolve 300 mL of tetraethylenepentamine in 3 mL of deionized water, then add it into the mixture, and let it stand at room temperature for 40 min to obtain a suspension of epoxy microcapsules, wash the suspension three times with water, filter, and dry at room temperature for 24 h , to obtain epoxy microcapsules.

[0029] (2) Add 1 g polyisobutylene (molecular weight: 2400) to 100...

Embodiment 2

[0032](1) Add 1 g of polyvinyl alcohol (polymerization degree: 2600) to 100 mL of deionized water, and stir magnetically at 80 °C for 12 h to obtain an aqueous solution of polyvinyl alcohol. Add 30 mg of silica nanoparticles to 6 mL of polyvinyl alcohol aqueous solution for ultrasonic dispersion for 1 min, add 1.8 g of epoxy resin, mix the oil and water phases, and emulsify at a high speed of 3000 rpm to obtain an oil-in-water skin stabilized by silica nanoparticles Crean Lotion. Then add 180 mL of isophorone diisocyanate to the Pickering emulsion, and mix evenly to obtain a mixed solution. After dissolving 150 mL tetraethylenepentamine in 3 mL deionized water, add it to the mixture. Stand at room temperature for 40 min to obtain a suspension of epoxy microcapsules, wash the suspension three times with water, filter, and dry at room temperature for 24 h to obtain epoxy microcapsules.

[0033] (2) Add 1 g polyisobutylene (molecular weight: 2400) to 100 mL xylene, and stir mag...

Embodiment 3

[0036] (1) Add 1 g of polyvinyl alcohol (polymerization degree: 2600) to 100 mL of deionized water, and stir magnetically at 80 °C for 12 h to obtain an aqueous solution of polyvinyl alcohol. Add 30 mg of silica nanoparticles to 6 mL of polyvinyl alcohol aqueous solution for ultrasonic dispersion for 1 min, add 4.2 g of epoxy resin, mix the oil and water phases, and emulsify at 6000 rpm high speed shear to obtain silica nanoparticles stabilized oil-in-water skin Crean Lotion. Add 480 mL of isophorone diisocyanate to the Pickering emulsion, and mix evenly to obtain a mixed solution. Dissolve 450 mL of tetraethylenepentamine in 3 ml of deionized water, and then add it to the mixture. Stand at room temperature for 40 min to obtain a suspension of epoxy microcapsules, wash the suspension three times with water, filter, and dry at room temperature for 24 h to obtain epoxy microcapsules.

[0037] (2) Add 1 g polyisobutylene (molecular weight: 2400) to 100 mL xylene, and stir magne...

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Abstract

The invention discloses a double-capsule self-repairing epoxy coating and a preparation method thereof. The preparation method mainly uses Pickering emulsion droplet template method and conducts an interface polymerization of interface isophorone diisocyanate and tetraethylenepentamine in water-oil of epoxy interface to prepare epoxy microcapsule and tetraethylenepentamine microcapsule; and the two microcapsules are added to epoxy resin microcapsules for the formation of double-capsule self-repairing epoxy coating. The Pickering emulsion droplet template method ensures the stability of the emulsion, prevents emulsion droplet blending, improves package amount and efficiency of the microcapsule core material; Pickering emulsion improves the repair efficiency of the double-capsule self-repairing epoxy coating; the introduction of nano silica particles and nano clay in the capsule walls of the epoxy microcapsule and tetraethylenepentamine microcapsule improves the mechanical strength and thermal stability of the microcapsule wall, but also improves the brittleness of the microcapsule and the releasing efficiency of the microcapsule core material, so as to ensure the repair performance of the double-capsule self-repair coating.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to a double-capsule self-repairing epoxy coating and a preparation method thereof. Background technique [0002] Self-healing materials are a very important part of intelligent bionic materials, and they have broad application prospects in many fields such as aerospace and automobile industries. It can automatically respond to external stimuli, repair damaged parts in materials and maintain material properties. Since White (Nature, 2001, 409: 794-797) developed the first generation of microcapsule self-healing systems for epoxy resins, microcapsule self-healing composites have been intensively studied for their high-efficiency repair properties. The microcapsules embedded in this self-healing material can break when a crack occurs in the matrix material, release the repair agent into the crack, and fill the crack through the curing reaction to realize the repair of the ...

Claims

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Application Information

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IPC IPC(8): B01J13/16B01J13/22
CPCB01J13/16B01J13/22
Inventor 王朝阳易欢
Owner SOUTH CHINA UNIV OF TECH
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