Nitrogen-contained phenol-formaldehyde resin, its preparation method and application
A technology of phenolic resin and nitrogen-containing monomers, applied in the direction of layered products, etc., can solve the problems of high requirements for operation means and reaction equipment, low product consistency, etc., and achieve high product quality consistency, low cost, and stable process Effect
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Embodiment 1
[0026] In a 250ml three-necked flask, install a mechanical stirrer, a thermometer and a condenser, add 100g (0.5mol) bisphenol F, 68.9g (0.85mol) 37% formaldehyde solution, 37.5g (0.3mol) methyl melamine and 1ml concentrated hydrochloric acid, Heat to 85-90°C to react for 5 hours, distill off moisture and unreacted substances under reduced pressure, and raise the internal temperature to 180°C to obtain 145g of yellow-brown solid (A)
[0027] Measurement (elemental analysis): nitrogen content 14.5%
Embodiment 2
[0029] The device is the same as in Example 1, add 110g (1.0mol) resorcinol, 64.9g (0.8mol) 37% formaldehyde solution, 25.2g (0.2mol) melamine and 1ml triethylamine, react for 5 hours at 80~85°C, then Then gradually raise the temperature to 160°C, and at the same time evaporate water and unreacted substances under reduced pressure to obtain 145g of yellow solid (B)
[0030] Measurement (elemental analysis): Nitrogen content 11.6%
Embodiment 3
[0032] The device is the same as in Example 1, add 94g (1.0mol) phenol, 60.8g (0.75mol) formaldehyde solution, 25.2g (0.2mol) benzomelamine, 1ml 36% hydrochloric acid solution, heat to 90°C for 3 hours, and distill under reduced pressure Remove moisture and unreacted substances, and gradually raise the internal temperature to 170°C to obtain 127g of yellow solid (C)
[0033] Measurement (elemental analysis): nitrogen content 13.2%
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