Cyclohexanone-melamine-formaldehyde polycondensation resin and preparation method thereof
A technology of co-condensation resin and melamine, which is applied in the field of coating/ink additives, can solve the problems of weak anti-yellowing performance, low softening point, and poor anti-powdering ability, and achieve good solvent compatibility and high resin yield , the effect of improving performance
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Embodiment 1
[0033] Catalyst: 30 parts by mass of sodium hydroxide and 70 parts by mass of deionized water are made into an aqueous catalyst solution for future use.
[0034] Add 126kg of melamine and 500kg of 37% industrial formaldehyde solution into the reaction kettle, adjust the pH value to 9 with the catalyst aqueous solution, heat up to 80°C, keep the temperature for 3 hours, detect and adjust the pH value to 10 with the catalyst aqueous solution; join the industrial 980kg of cyclohexanone and 560kg of 37% industrial formaldehyde solution adjusted to pH 10 in advance with catalyst aqueous solution, stirred, kept reacting at 90°C for 5h, added deionized water, and washed the resin 6 times at 80°C. After washing for the first time, vacuum the upper layer of water; heat up and evaporate, when the temperature reaches 110°C, turn on the vacuum pump, gradually evacuate to -0.098Mpa, gradually raise the temperature to 150°C, keep the temperature and vacuum for 1 hour, stop Stir, feed nitrog...
Embodiment 2
[0036] Catalyst: 20 parts by mass of 80% potassium hydroxide and 80 parts by mass of deionized water are made into an aqueous catalyst solution for future use.
[0037] Add 100kg of melamine and 300kg of 37% industrial formaldehyde solution into the reaction kettle, adjust the pH value to 11 with an aqueous catalyst solution, heat up to 80°C, keep the temperature for 1 hour, detect and adjust the pH value to 11 with an aqueous catalyst solution; join the industrial Cyclohexanone kg and 1000 kg of 37% industrial formaldehyde solution adjusted to pH 10 in advance with the catalyst aqueous solution, stirred, kept reacting at 100°C for 2h, added deionized water, and washed the resin 4 times at 90°C, each After washing for the first time, use vacuum to absorb the upper layer of water; heat up and evaporate, when the temperature reaches 110°C, turn on the vacuum pump, gradually evacuate to -0.098Mpa, gradually raise the temperature to 150°C, and keep the temperature and vacuum for 1 ...
Embodiment 3
[0039] Catalyst: 30 parts by mass of sodium hydroxide, 10 parts by mass of 80% potassium hydroxide, and 60 parts by mass of deionized water, made into an aqueous catalyst solution for future use.
[0040] Add 150kg of melamine and 400kg of 37% industrial formaldehyde solution into the reaction kettle, adjust the pH value to 10 with an aqueous catalyst solution, heat up to 70°C, keep the temperature for 2 hours, detect and adjust the pH value to 12 with an aqueous catalyst solution; join the industrial 1020kg of cyclohexanone and 1060kg of 37% industrial formaldehyde solution whose pH value was adjusted to 10 with a catalyst aqueous solution in advance, stirred, kept reacting at 90°C for 4h, added deionized water, and washed the resin 5 times at 90°C. After washing for the first time, use vacuum to absorb the upper layer of water; heat up and evaporate, when the temperature reaches 110°C, turn on the vacuum pump, gradually evacuate to -0.098Mpa, gradually raise the temperature t...
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