Benzoxazine/epoxy resin composite flame-retardant anticorrosive coating and preparation method thereof
A technology of epoxy resin and benzoxazine, which is applied in the field of flame-retardant anti-corrosion coating and its preparation, can solve the problems of poor toughness, environmental pollution, human body and environmental hazards, etc., achieve good bonding ability, simple preparation process, The effect of low equipment requirements
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Embodiment 1
[0034] (1) Add 12.60g of melamine and 48.60g of formaldehyde solution into a 500mL four-necked round-bottomed flask equipped with a stirrer, thermometer and reflux condenser, and heat up to 60°C for 0.5h under stirring until the reaction system becomes free. When the color is transparent liquid; then add 49.26g eugenol and 50ml ethanol, reflux reaction for 6h, after the reaction, the organic phase is distilled under reduced pressure to 80°C to obtain a benzoxazine monomer containing triazine cycloeugenol.
[0035] (2) Add 16.58g of DOPO and 60.18g of bisphenol A epoxy resin into a 250mL four-necked round-bottomed flask equipped with a stirrer, thermometer and reflux condenser, stir and heat to 90°C, after DOPO is completely dissolved, then The temperature was raised to 150° C. for 5 hours, and a colorless and transparent phosphorus-containing epoxy resin solid was obtained at room temperature after the reaction.
[0036] (3) Add 14.48g of DOPO and 52.4g of triethylene glycol d...
Embodiment 2
[0039] (1) In a 500mL four-necked round-bottom flask equipped with a stirrer, thermometer and reflux condenser, add 12.60g of melamine and 48.60g of formaldehyde solution and heat up to 60°C for 1 hour under stirring until the reaction system becomes colorless When it is a transparent liquid, add 49.26g of isoeugenol and 40ml of ethanol, heat up to reflux state and react for 6 hours. After the reaction, the organic phase is distilled to 80°C under reduced pressure to obtain a triazine ring-containing isoeugenol benzoxazine monomer.
[0040] (2) Phosphorus-containing epoxy resin was synthesized according to step (2) of Example 1.
[0041] (3) Add 12.04g of DOPO and 43.60g of diglycidyl ether of diethylene glycol into a 250mL four-neck round bottom flask equipped with a stirrer, thermometer and reflux condenser, stir and heat up to 90°C until DOPO is completely dissolved , and then raised the temperature to 150° C. for 5 h reaction, and obtained a colorless and transparent phosp...
Embodiment 3
[0044] (1) In a 500mL four-necked round-bottomed flask equipped with a stirrer, a thermometer and a reflux condenser, add 12.60g of melamine and 49.20g of formaldehyde solution and heat up to 60°C for 0.5h under stirring. When the color is transparent liquid; then add 37.20g guaiacol and 50ml ethanol, heat up to reflux state and react for 6h, after the reaction, the organic phase is distilled to 80°C under reduced pressure to obtain guaiacol benzoxazine containing triazine ring monomer.
[0045] (2) Phosphorus-containing epoxy resin was synthesized according to step (2) of Example 1.
[0046] (3) Add 11.16g of DOPO and 40.40g of 1,4-butanediol diglycidyl ether into a 250mL four-neck round bottom flask equipped with a stirrer, thermometer and reflux condenser, stir and heat to 90°C, and wait for DOPO After all dissolved, the temperature was raised to 150° C. for 5 hours to react, and a colorless and transparent phosphorus-containing glycidyl ether liquid at room temperature wa...
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