A self-repairing anti-corrosion coating based on polysilazane microcapsules and its preparation method
A polysilazane, anti-corrosion coating technology, applied in anti-corrosion coatings, coatings, polyester coatings, etc., can solve the problems of anti-corrosion coating damage, high economic cost of coating micro-crack detection and repair, and achieve extended service. Duration, concise repair agent system, the effect of simplifying the preparation process
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Embodiment 1
[0030] Add 50 grams of permethylpolysilazane to 300 grams of an emulsification system containing 2% PVA and 0.3% SDBS, then add 3 drops of n-octanol as a defoamer, and stir at room temperature For 24 hours, the mechanical stirring speed was 250 rpm, and filtered to obtain permethylpolysilazane microcapsules. The particle diameter of the permethylpolysilazane microcapsule is 10-900 μm, and the thickness of the capsule wall is 40-1000 nm.
[0031] Add 12.5 parts of diethylenetriamine to 100 parts of EPON 828 epoxy resin as curing agent, then add 20 parts of permethylpolysilazane microcapsules, mix well, remove the bubbles of the mixed system under reduced pressure, and obtain Anti-corrosion coating solution with repair function. The composite material was coated on a thin steel sheet (45# steel), fixed at room temperature for 24 hours and then cured at 80°C for 12 hours to obtain a test sample with a self-repairing anti-corrosion coating.
[0032] The self-healing effect of th...
Embodiment 2
[0034] Add 50 grams of polymethylhydrogensilazane to 300 grams of emulsification system containing 2% PVA and 0.3% SDBS in mass fraction, then add 3 drops of n-octanol as defoamer, and stir at room temperature After 24 hours, the mechanical stirring speed was 250 rpm, and the mixture was filtered to obtain polymethylhydrogensilazane microcapsules. The particle size of the polymethylhydrosilazane microcapsule is 10-900 μm, and the thickness of the capsule wall is 40-1000 nm.
[0035] Add 12.5 parts of diethylenetriamine to 100 parts of EPON 828 epoxy resin as curing agent, then add 5 parts of polymethylhydrogensilazane microcapsules, mix well, remove the bubbles of the mixed system under reduced pressure, and obtain Anti-corrosion coating solution with repair function. The composite material was coated on a thin steel sheet (45# steel), fixed at room temperature for 24 hours and then cured at 80°C for 12 hours to obtain a test sample with a self-repairing anti-corrosion coatin...
Embodiment 3
[0037] In 100 parts of EPON 828 epoxy resins, add 12.5 parts of diethylenetriamine as curing agent, then add 20 parts of polymethylhydrogensilazane microcapsules prepared in Example 2, mix uniformly, remove the mixed system under reduced pressure Bubbles, to obtain a self-healing anti-corrosion coating stock solution. The composite material was coated on a thin steel sheet (45# steel), fixed at room temperature for 24 hours and then cured at 80°C for 12 hours to obtain a test sample with a self-repairing anti-corrosion coating. The self-healing efficiency of Example 3 compared to Comparative Example 1 is 84% as measured by neutral salt spray.
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