Self-healing epoxy powdery coating containing microcapsule and preparation method thereof

A technology of epoxy powder and powder coating, which is applied in the field of coatings, can solve the problems of increasing economic costs, etc., and achieve the effects of reducing cumbersome work, stable storage, and improving the effect of self-healing

Inactive Publication Date: 2015-11-11
南通南京大学材料工程技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general powder coating is beautiful and environmentally friendly, so it is used in decorative coatings, but repainting and repairing the coating after damage will increase the economic cost. In order to reduce the repair cost and prolong the service life of epoxy powder coatings, we thought of Research on a self-healing epoxy powder coating containing microcapsules is used for repairing micro-cracks on the surface of materials, thereby saving economic costs. Its preparation method has very important significance and application value

Method used

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  • Self-healing epoxy powdery coating containing microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 5 g of urea in 200 ml of 2.5% ethylene maleic anhydride (EMA) solution under stirring environment. After all the urea is dissolved, add 0.5 g of ammonium chloride and resorcinol respectively. Use hydrochloric acid and sodium hydroxide to adjust the pH of the reaction system to 4-5, then add 60ml of dicyclopentadiene, and after the emulsion is formed stably, finally add 13g of 37% formaldehyde solution. The system was heated to 55°C at 1°C / min and reacted for 4h. Cool to room temperature, filter and wash, and air dry naturally.

[0037] Epoxy resin: 300 parts; polyester resin: 300 parts, titanium dioxide: 200 parts; precipitated barium sulfate: 150 parts; leveling agent: 15 parts; brightener: 15 parts; benzoin: 15 parts; wax powder: 5 parts ; Mixing and extruding with a twin-screw extruder. After secondary pulverization, 15 parts of self-healing microcapsules and 3 parts of Grubbs catalyst were added and mixed evenly. Spray under electrostatic conditions, the...

Embodiment 2

[0039] Dissolve 5 g of urea in 200 ml of 2.5% ethylene maleic anhydride (EMA) solution under stirring environment. After all the urea is dissolved, add 0.5 g of ammonium chloride and resorcinol respectively. Use hydrochloric acid and sodium hydroxide to adjust the pH of the reaction system to 4-5, then add 60ml of dicyclopentadiene, and after the emulsion is formed stably, finally add 13g of 37% formaldehyde solution. The system was heated to 55°C at 1°C / min and reacted for 4h. Cool to room temperature, filter and wash, and air dry naturally.

[0040] Epoxy resin: 300 parts; polyester resin: 300 parts, titanium dioxide: 220 parts; precipitated barium sulfate: 140 parts; leveling agent: 15 parts; brightener: 15 parts; benzoin: 15 parts; wax powder: 5 parts ; Mixing and extruding with a twin-screw extruder. After secondary pulverization, add 10 parts of self-healing microcapsules and 3 parts of Grubbs catalyst and mix well. Spray under electrostatic conditions, then cure at 1...

Embodiment 3

[0042] Dissolve 5 g of urea in 200 ml of 2.5% ethylene maleic anhydride (EMA) solution under stirring environment. After all the urea is dissolved, add 0.5 g of ammonium chloride and resorcinol respectively. Use hydrochloric acid and sodium hydroxide to adjust the pH of the reaction system to 4-5, then add 60ml of dicyclopentadiene, and after the emulsion is formed stably, finally add 13g of 37% formaldehyde solution. The system was heated to 55°C at 1°C / min and reacted for 4h. Cool to room temperature, filter and wash, and air dry naturally.

[0043] Epoxy resin: 350 parts; polyester resin: 250 parts, titanium dioxide: 200 parts; precipitated barium sulfate: 150 parts; leveling agent: 15 parts; brightener: 15 parts; benzoin: 15 parts; wax powder: 5 parts ; Mixing and extruding with a twin-screw extruder. After secondary pulverization, 5 parts of self-healing microcapsules and 3 parts of Grubbs catalyst were added and mixed evenly. Spray under electrostatic conditions, then...

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Abstract

The present invention discloses a self-healing epoxy powdery coating containing microcapsule. The self-healing epoxy powdery coating containing microcapsule consists of the following components by weight: 5-15 parts of microcrack self-healing capsule, 2-4 parts of a Grubbs catalyst and 89-93 parts of epoxy powder resin matrix. The capsule wall of the self-healing microcapsule is theurea-formaldehyde resin prepared from urea and 37% formaldehyde solution in molar ratio of 0.5-0.6:1, and the capsule core is dicyclopentadiene by blending and high pressure electrostatic spraying. The housing capsule wall of the microcapsule is urea-formaldehyde resin; and the mass ratio of the inner capsule core to capsule wall is 5:1. When the coating cracks, the microcapsule ruptures, and dicyclopentadiene rapidly penetrates into the crazing and the met Grubbs catalyst to produce cross-linking, in order to achieve the purpose of repair. The invention prolongs the service life of the powdery coating and is applicable to novel industrial production.

Description

technical field [0001] The invention relates to the preparation and application of a self-repairing epoxy powder coating containing microcapsules, belonging to the technical field of coatings. Background technique [0002] Self-healing epoxy powder coating is a surface coating with self-healing function that combines self-healing materials with traditional epoxy powder coatings. Self-healing epoxy powder coatings enable materials to self-heal without affecting the original operating process or affecting the surface finish of the material. Easy to operate, stable reaction, easy to control process conditions, good surface effect and environmental protection, etc., make it widely used in surface spraying of metal and wood materials. [0003] Traditional powder coatings cannot self-heal without the assistance of external conditions, so when micro-cracks occur on the coating surface, traditional powder materials will slowly accumulate and eventually cause the appearance to defor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D167/00C09D5/03C09D7/12
Inventor 任华张鹏飞张亚仇叶云曹婷婷操振华
Owner 南通南京大学材料工程技术研究院
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