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Self-repair powder coating applicable to aluminum material

A powder coating and self-healing technology, applied in the field of coatings, can solve problems such as appearance deformation of powder materials

Inactive Publication Date: 2016-05-18
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional powder coatings cannot self-recover without the assistance of external conditions, so when micro-cracks occur on the coating surface, traditional powder materials will slowly accumulate and eventually lead to deformation of the appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Epoxy resin: 500 parts; precipitated barium sulfate: 400 parts; 40 parts of curing agent, 5 parts of charge regulator, 25 parts of pigment; mixed and extruded by twin-screw extruder. After secondary crushing, 30 parts of self-repairing microcapsules and 6 parts of catalyst were added and mixed evenly. Preparation of self-healing microcapsules: Dissolve urea in 2.5% ethylene maleic anhydride EMA solution under stirring environment, after the urea is completely dissolved, add appropriate amount of ammonium chloride and resorcinol; adjust the reaction with hydrochloric acid and sodium hydroxide System pH = 4.5, then add dicyclopentadiene, after the stable emulsion is formed, finally add 37% formaldehyde solution, the ratio of urea and 37% formaldehyde solution is 1:2; the above reaction system is heated to React at 55°C for 5 hours; cool to room temperature, filter and wash, and air-dry; sieve to get the product of 200-220 mesh.

Embodiment 2

[0011] Epoxy resin: 500 parts; precipitated barium sulfate: 380 parts; 40 parts of curing agent, 5 parts of charge regulator, 25 parts of pigment; mixed and extruded by twin-screw extruder. After secondary pulverization, add 50 parts of self-healing microcapsules and 10 parts of catalyst and mix well. Preparation of repair microcapsules: Dissolve urea in 2.5% ethylene maleic anhydride EMA solution under stirring environment, after the urea is completely dissolved, add appropriate amount of ammonium chloride and resorcinol; adjust the reaction system with hydrochloric acid and sodium hydroxide pH = 4.5, then add dicyclopentadiene, after the stable emulsion is formed, finally add 37% formaldehyde solution, the ratio of urea and 37% formaldehyde solution is 1:2; the above reaction system is heated to 55 React at ℃ for 5 hours; cool to room temperature, filter and wash, and air-dry; sieve to get the product of 200-220 mesh.

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PUM

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Abstract

The invention discloses a self-repair powder coating applicable to an aluminum material. The self-repair powder coating is used for electrostatic spraying preparation and application. The powder coating is prepared from, by weight, 450-650 parts of epoxy resin, 300-400 parts of pre-cipitated barium sulfate, 40-50 parts of a curing agent, 5-10 parts of a charge control agent, 20-30 parts of pigment and 40-60 parts of self-repair microcapsules with the catalysis effect. When the coating produces a microcrack, the microcapsules are broken, dicyclopentadiene will rapidly permeate into silver streaks, acts when encountering Grubbs catalyst to produce polymerization and crosslinking, and therefore the repair purpose is achieved. Accordingly, the service life of the powder coating is prolonged, and the self-repair powder coating is applicable to novel industrial production.

Description

technical field [0001] The invention relates to a self-repairing powder coating suitable for aluminum materials, which belongs to the technical field of coatings. Background technique [0002] 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 deform. When tiny cracks occur on the surface of the self-healing coating, the nano-scale microcapsules inside the material will gradually release and combine with the catalyst to rebond the cracks, which can fundamentally heal or prevent cracks, and finally restore the performance of the coating. Contents of the invention [0003] The object of the invention is to invent an epoxy powder coating with a self-repairing function, which is prepared by blending the self-repairing microcapsules with the powder coating and applied to the surface of metal alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D7/12C09D5/03
Inventor 张鹏飞任华张亚仇叶云曹婷婷
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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