Self-healing microcapsule and preparation method thereof, paint, coating and epoxy resin composite material

A self-healing microcapsule, epoxy resin technology, applied in epoxy resin coatings, microcapsule preparations, microsphere preparation and other directions, can solve the problems of slow pH adjustment and complex process

Inactive Publication Date: 2017-09-15
河北京津冀再制造产业技术研究有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Invention describes a way for create tiny capsule systems that automatically heals damage caused during use or maintenance processes such as cracked coatings made from composites containing these components. These small particles have unique properties like repairable walls with UV light absorbing agents attached thereto. They also contain certain chemicals called reactive ingredients (RCA). By mixing specific types of liquid together they form minute droplets when mixed properly, resulting in stable mixtures at room temperature. When exposed to ultraviolet rays, it becomes hardened due to crosslinking between polymers within the mixture.

Problems solved by technology

This patents describes two technical ways how to improve the performance of polymers made from synthetic organism. One way involves adding certain substances called “self-repairs” to prevent degradations caused by environmental factors like temperature fluctuations and pressure changes. Another approach includes incorporating these substance within the polymers themselves through encasing them therewith without losing their original function after being broken down due to natural causes like corrosion. These techniques aim to enhance the strength and durability of the resulting products while minimizing any potential failings associated with traditional approaches involving metal particles.

Method used

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  • Self-healing microcapsule and preparation method thereof, paint, coating and epoxy resin composite material
  • Self-healing microcapsule and preparation method thereof, paint, coating and epoxy resin composite material
  • Self-healing microcapsule and preparation method thereof, paint, coating and epoxy resin composite material

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preparation example Construction

[0040] In view of the current situation that polymer composite materials in the prior art are prone to cracks under the influence of external force and environment, the embodiment of the present invention discloses a preparation method of self-healing microcapsules, which includes the following steps:

[0041] A), emulsifier, urea, formaldehyde, reaction accelerator, ethyl phenylacetate are mixed with water, emulsified, and emulsion is obtained;

[0042] B), heating and reacting the emulsion to obtain self-healing microcapsules.

[0043] This application adopts a one-step method to in-situ synthesize urea-formaldehyde resin self-healing microcapsules. This method does not need to prepare urea-formaldehyde prepolymer in advance, but directly forms the capsule wall of the microcapsules by polycondensation and solidification of urea and formaldehyde under acidic conditions. Ethyl acetate is used as the core material of the repair agent to form microcapsules.

[0044] Specificall...

Embodiment 1

[0059] Embodiment 1 self-healing microcapsule / epoxy resin TDCB sample

[0060] (1) Preparation of emulsifier solution: Add 1.25g of deionized water and 50g of ethylene maleic anhydride copolymer (EMA) into a beaker, stir the solution and heat it to 80°C for 1h to fully dissolve the EMA to obtain 2.5%EMA aqueous solution;

[0061] (2) Preparation of wall material solution: at room temperature, add 5.00g of urea, 0.50g of resorcinol and 0.50g of ammonium chloride into the reaction kettle, add 200g of deionized water to fully stir and dissolve the feed, and then add 50mL of the above steps (1) The prepared 2.5% EMA solution is fully stirred and mixed evenly, the pH of the obtained solution is 3.00 to 3.10, and the pH of the above solution is adjusted to 3.5 by using 5% NaOH solution;

[0062] (3) Microcapsule emulsification: Slowly add 45g of ethyl phenylacetate (restorative agent) to the solution prepared in step (2), stir with a high-speed shear emulsifier, the emulsification ...

Embodiment 2

[0066] Embodiment 2 microcapsule intelligent self-healing coating

[0067] (1) Preparation of emulsifier solution: Add 1.25g of deionized water and 50g of ethylene maleic anhydride copolymer (EMA) into a beaker, stir the solution and heat it to 80°C for 1h to fully dissolve the EMA to obtain 2.5%EMA aqueous solution;

[0068] (2) Preparation of wall material solution: at room temperature, add 5.00g of urea, 0.50g of resorcinol, and 0.50g of ammonium chloride into the reaction kettle, add 200g of deionized water to fully stir and dissolve the feed, and then add 50mL of the above steps (1) The prepared 2.5% EMA solution is fully stirred and mixed evenly, the pH of the obtained solution is 3.00 to 3.10, and the pH of the above solution is adjusted to 3.5 by using 5% NaOH solution;

[0069] (3) Microcapsule emulsification: Slowly add 45g of ethyl phenylacetate (restorative agent) to the solution prepared in step (2), stir with high-speed shear emulsifier, emulsification speed is ...

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Abstract

The invention provides a self-healing microcapsule preparation method. The method comprises the following steps: A) mixing an emulsifier, urea, formaldehyde, a reaction promoter, ethyl phenylacetate and water, performing emulsification to obtain an emulsion; and B) heating the emulsion and reacting the emulsion to obtain the self-healing microcapsule. The self-healing microcapsule is characterized in that the capsule wall of the self-healing microcapsule is urea-formaldehyde resin, and a core material comprises ethyl phenylacetate. The invention also provides a paint containing the above self-healing microcapsule and an epoxy resin composite material. The self-healing microcapsule has the advantages of simple process, structured microcapsule morphology and good stability. The core material ethyl phenylacetate has swelling effect to epoxy resin, by using a principle, the solvent-type self-healing microcapsule is capable of healing the matrix crack of epoxy resin.

Description

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Claims

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Application Information

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Owner 河北京津冀再制造产业技术研究有限公司
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