Composite coating and preparation method thereof
A composite coating and composite technology, applied in anti-corrosion coatings, epoxy resin coatings, anti-fouling/underwater coatings, etc., can solve the problem of easy agglomeration, failure to give full play to the advantages of silicon carbide nanoparticles, and accelerated penetration of corrosive media, etc. question
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preparation example Construction
[0111] In order to further improve the anticorrosion performance, antifouling performance, impact resistance and wear resistance of the composite coating, preferably, the preparation method of the hydrophobic silicon carbide / boron nitride composite comprises:
[0112] (1) Disperse hydroxylated boron nitride and siloxane coupling agent I in organic solvent II, heat I, separate I, wash I, and dry I to obtain coupling agent grafted boron nitride;
[0113] Disperse hydrophobic silicon carbide and siloxane coupling agent II in organic solvent III, heat II, separate II, wash II, and dry II to obtain coupling agent grafted silicon carbide;
[0114] (2) Disperse the coupling agent-grafted silicon carbide and the coupling agent-grafted boron nitride III in the organic solvent IV, heat III, separate III, wash III, and dry III to obtain hydrophobic silicon carbide / nitrogen boron compound.
[0115] In order to further improve the anticorrosion performance, antifouling performance, impact...
preparation example 1
[0207] (1) Ultrasonic disperse hexagonal boron nitride (ultrasonic power is 160W, ultrasonic time is 45min) in mixed acid solution-1 (the molar solubility of sulfuric acid aqueous solution is 16mol / L, the solubility of nitric acid aqueous solution is 12mol / L, sulfuric acid The weight ratio of aqueous solution and nitric acid aqueous solution is 1:3), wherein the weight ratio of boron nitride and mixed acid solution is 1:250, heating (temperature is 80 ℃, time is 12h), filtration and separation, Repeated washing and drying (at a temperature of 80°C for 16 hours) to obtain hydroxylated boron nitride;
[0208] Ultrasonic dispersion of silicon carbide and hydrophobic modifier-1 (ultrasonic power 160W, ultrasonic time 45min) in organic solvent-1 to obtain a suspension, wherein hydrophobic modifier-1, silicon carbide and organic solvent-1 The weight ratio of the suspension is 1:3:300, the suspension is mixed with water in a weight ratio of 1:0.02, heated (at a temperature of 75°C, f...
preparation example 2
[0213] (1) ultrasonically disperse hexagonal boron nitride (ultrasonic power is 100W, ultrasonic time is 30min) in mixed acid solution-2 (the molar solubility of sulfuric acid aqueous solution is 12mol / L, the solubility of nitric acid aqueous solution is 14.5mol / L, The weight ratio of sulfuric acid aqueous solution and nitric acid aqueous solution is 1:4), wherein, the weight ratio of boron nitride and mixed acid solution is 1:200, heating (temperature is 60 °C, time is 18h), filtration and separation , washed several times, and dried (at a temperature of 60° C. for 24 hours), to obtain hydroxylated boron nitride;
[0214] Ultrasonic dispersion of silicon carbide and hydrophobic modifier-2 (ultrasonic power 100W, ultrasonic time 30min) in organic solvent-2 to obtain a suspension, wherein hydrophobic modifier-2, silicon carbide and organic solvent-2 The weight ratio of the suspension is 1:0.5:100, the suspension is mixed with water in a weight ratio of 1:0.01, heated (at a temp...
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