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

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Problems solved by technology

Most traditional methods use emulsifier-stabilized emulsions to prepare microcapsules, but such emulsifier-stabilized emulsions often cannot provide sufficient

Method used

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

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] (1) Add 1 g of polyvinyl alcohol (polymerization degree 2600) to 100 mL of deionized water, and magnetically stir for 12 h at 80°C 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, and emulsify at 9000 rpm high-speed shear to obtain a stable oil-in-water skin of silica nanoparticles Kelin emulsion; then add 300 ml isophorone diisocyanate to Pickering emulsion and mix well to obtain a mixed solution. After dissolving 300 mL of tetraethylenepentamine in 3 mL of deionized water, add it to the mixed solution and let stand at room temperature for 40 minutes to obtain an epoxy microcapsule suspension. The suspension was washed 3 times with water, filtered, and dried at room temperature for 24 h , Get epoxy microcapsules.

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

Example Embodiment

[0031] Example 2

[0032] (1) Add 1 g of polyvinyl alcohol (polymerization degree 2600) to 100 mL of deionized water, and magnetically stir for 12 h at 80°C 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 to mix the oil and water, and emulsify at 3000 rpm high-speed shear to obtain a stable oil-in-water skin of silica nanoparticles Kling lotion. Then add 180 mL of isophorone diisocyanate to Pickering emulsion and mix well to obtain a mixed solution. After dissolving 150 mL of tetraethylenepentamine in 3 mL of deionized water, add it to the mixed solution. Let it stand for 40 min at room temperature to obtain an epoxy microcapsule suspension. The suspension was washed 3 times with water, filtered, and dried at room temperature for 24 h to obtain epoxy microcapsules.

[0033] (2) Add 1 g of polyisobutylene (molecular weight 2400) to 100 ...

Example Embodiment

[0035] Example 3

[0036] (1) Add 1 g of polyvinyl alcohol (polymerization degree 2600) to 100 mL of deionized water, and magnetically stir for 12 h at 80°C 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, and emulsify at 6000 rpm to obtain a stable oil-in-water skin of silica nanoparticles. Kling lotion. Then add 480 mL of isophorone diisocyanate to Pickering emulsion and mix well to obtain a mixed solution. After dissolving 450 mL of tetraethylenepentamine in 3 mL of deionized water, add it to the mixed solution. Let it stand for 40 min at room temperature to obtain an epoxy microcapsule suspension. The suspension was washed 3 times with water, filtered, and dried at room temperature for 24 h to obtain epoxy microcapsules.

[0037] (2) Add 1 g of polyisobutylene (molecular weight 2400) to 100 mL of xylene and s...

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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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