Benzoxazine, preparation method thereof, coating and method for forming coating on surface of substrate
A benzoxazine and coating technology, applied in the field of benzoxazine and its preparation, can solve problems such as catastrophic accidents, resource consumption, and environmental pollution
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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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