Benzoxazine, method for its preparation, coating, and method for forming a coating on a substrate surface
A benzoxazine and substrate surface technology, applied in the field of benzoxazine and its preparation, can solve the problems of polluting the environment, affecting the national economy, restricting the normal operation of industries, etc., and achieve excellent corrosion resistance
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[0036] [The preparation method of benzoxazine]
[0037] In some embodiments, the preparation method of benzoxazine comprises the following steps: step S1, dissolving curcumin, paraformaldehyde or formaldehyde in the first organic solvent to obtain the first solution; step S2, obtaining the first solution from step S1 Add the amine compound and the second organic solvent to the first solution, then react at 20-180°C for 1-48h, cool down after the reaction, remove the excess first organic solvent and the second organic solvent by rotary evaporation, and obtain the benzoxan A concentrated solution of oxazine; wherein, the amine compound includes a primary amine group.
[0038] The preparation method of the benzoxazine of the present application has simple synthesis steps and processes, mild reaction conditions, and simple and easy operation.
[0039] In some embodiments, the amine compound is a silane coupling agent containing primary amine groups. In some embodiments, the silane...
Embodiment 1
[0062] Weigh (0.01mol, 3.68g) curcumin, (0.04mol, 1.22g) paraformaldehyde in a 250mL three-necked flask, add 25mL of methanol, ultrasonically disperse, so that curcumin is fully dissolved; then add (0.04mol, 4.42 g) γ-Aminopropyltriethoxysilane and 100mL of dimethyl sulfoxide were reacted in an oil bath at 80°C for 6h; Add it to petroleum ether solution to obtain a viscous liquid, and obtain a concentrated liquid after separation, which is the benzoxazine monomer.
[0063] Dissolve the benzoxazine monomer in chloroform, and then spin-coat it on a clean glass or carbon steel surface for curing. The curing process is as follows: first cure at 60°C for 1 hour, then cure at 180°C for 2 hours, Then it was cured at 200°C for 2 hours, and finally at 220°C for 2 hours to obtain a coating.
Embodiment 2
[0065] Weigh (0.014mol, 5g) of curcumin, (0.197mol, 6g) of paraformaldehyde in a three-necked flask of 250mL, add 50mL of methanol, ultrasonically disperse, so that curcumin is fully dissolved; then add (0.045mol, 5g ) of γ-aminopropyltriethoxysilane and 250mL of 1,4-dioxane, react in an oil bath at 85°C for 6h; Add it dropwise into the petroleum ether solution to obtain a viscous liquid, and obtain a concentrated liquid after separation, which is the benzoxazine monomer.
[0066] Dissolve the benzoxazine monomer in chloroform, and then spin-coat it on a clean glass or carbon steel surface for curing. The curing process is as follows: first cure at 60°C for 1 hour, then cure at 180°C for 2 hours, Then it was cured at 200°C for 2 hours, and finally at 250°C for 2 hours to obtain a coating.
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