Molybdate doped polypyrrole/epoxy resin self-healing coating, preparation method thereof and application thereof
A technology of epoxy resin coating and epoxy resin, applied in the direction of epoxy resin coating and coating, can solve the problems of complicated preparation process, and achieve the effects of simple preparation process, good compactness and excellent electrochemical activity
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[0031] (1) Preparation of molybdate-doped polypyrrole (parts by mass): Add 1 to 3 parts of pyrrole monomer dropwise in 4 to 8 parts of sodium molybdate aqueous solution, and add 50 to 60 parts of oxidant ammonium persulfate aqueous solution dropwise. Parts, magnetically stirred and polymerized at 0-2°C in a nitrogen atmosphere for 5-6 hours, filtered, washed, and vacuum-dried at 50-70°C for 5-10 hours to obtain black molybdate-doped polypyrrole.
[0032] (2) Preparation of polypyrrole-epoxy resin coating (parts by mass): Take 8-20 parts of the prepared molybdate-doped polypyrrole, add 70-80 parts of organic solvent, anti-sedimentation agent, defoamer and fluid 0.7-1 parts of each leveling agent (anti-settling agent, defoamer, and leveling agent are commonly used additives for epoxy resin coatings, such as: anti-settling agent is modified hydrogenated castor oil, defoaming agent is methyl silicone oil or fatty acid alkanes Base ester, leveling agent is silane or acrylate), 140-...
Embodiment 1
[0036] Take 3.5 parts of dopant sodium molybdate, mix it with deionized water at a mass ratio of 1:45, and stir magnetically to form an aqueous solution of dopant. Keep the temperature of the entire reaction system at 2°C, add 2 parts of pyrrole monomer dropwise to the reaction system in a nitrogen atmosphere, and then add an aqueous solution of oxidant ammonium persulfate prepared in advance (the mass ratio of ammonium persulfate to deionized water is 1:17) 54 parts drop by drop. After magnetic stirring and polymerization for 6 hours, the reaction was stopped, the obtained product was filtered, and the filter cake was washed with deionized water several times. After the product was dried in a vacuum oven at 60° C. for 8 hours, black sodium molybdate-doped polypyrrole was obtained, and the doping amount of sodium molybdate in this embodiment was 10 wt%.
[0037] Take 8 parts of sodium molybdate doped with polypyrrole, and 80 parts of organic solvent are uniformly dispersed in...
Embodiment 2
[0048] Take 3.5 parts of dopant sodium molybdate, mix it with deionized water at a mass ratio of 1:50, and stir magnetically to form an aqueous solution of dopant. Keep the temperature of the entire reaction system at 2°C, add 2 parts of pyrrole monomer dropwise to the reaction system in a nitrogen atmosphere, and then add an aqueous solution of oxidant ammonium persulfate prepared in advance (the mass ratio of ammonium persulfate to deionized water is 1:7) 60 parts drop by drop. After magnetic stirring and polymerization for 6 hours, the reaction was stopped, the obtained product was filtered, and the filter cake was washed with deionized water several times. After the product was dried in a vacuum oven at 60° C. for 8 hours, black sodium molybdate-doped polypyrrole was obtained, and the doping amount of sodium molybdate in this embodiment was 12 wt%.
[0049] Take 12 parts of sodium molybdate doped with polypyrrole and 70 parts of organic solvent to disperse evenly in an ul...
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