Low-viscosity bisphenol A epoxide resin production method
A technology of epoxy resin and production method, applied in the production field of bisphenol A epoxy resin, can solve the problems of not recording the specific parameters of the product in detail, insurmountable, etc., achieving excellent storage stability, reducing failure maintenance rate, and high purity Effect
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Embodiment 1
[0026] ①Pre-reaction: bisphenol A, epichlorohydrin and Na 2 CO 3 Mix according to the molar ratio of 1:6~8:0.12, and react at 60~65℃ for 1h;
[0027] ②Reaction: Step ①The reaction product enters the reaction kettle, and under the protection of inert gas, under an absolute pressure of 15-20kPa vacuum, at a temperature of 50-55℃, dropwise add sodium hydroxide solution with a concentration of 40±0.5%, and massage The amount of sodium hydroxide is 1 times the amount of bisphenol A in step ①, the amount of sodium hydroxide is 1 times the amount of bisphenol A in step 1, and the epichlorohydrin is kept for reflux dehydration during the reaction, and the reaction time is 2h;
[0028] ③Removal of the solvent epichlorohydrin: After the reaction in step ② is completed, the epichlorohydrin is recovered by distillation at a temperature of 120°C and a vacuum degree of 10kPa; the remaining small amount of epichlorohydrin is removed by kettle evaporation , The operating pressure is absolute pres...
Embodiment 2
[0033] ①Pre-reaction: bisphenol A, epichlorohydrin and Na 2 CO 3 Mix according to the molar ratio of 1:6~8:0.12, and react at 60~65℃ for 1h;
[0034] ②Reaction: Step ①The reaction product enters the reaction kettle, and under the protection of inert gas, under an absolute pressure of 15-20kPa and vacuum, at a temperature of 50-55℃, add dropwise sodium hydroxide solution with a concentration of 55±0.5%, and massage The amount of sodium hydroxide is 3 times the amount of bisphenol A in step ①, the amount of sodium hydroxide is 3 times the amount of bisphenol A in step 1, and the epichlorohydrin is kept for reflux dehydration during the reaction, and the reaction time is 2h;
[0035] ③Removal of the solvent epichlorohydrin: After the reaction in step ② is completed, the epichlorohydrin is recovered by distillation at a temperature of 120°C and a vacuum degree of 10kPa; the remaining small amount of epichlorohydrin is removed by kettle evaporation , The operating pressure is absolute ...
Embodiment 3
[0040] ①Pre-reaction: bisphenol A, epichlorohydrin and Na 2 CO 3 Mix at a molar ratio of 1:6~8:0.12, and react for 1.5h at a temperature of 60~65℃;
[0041] ②Reaction: Step ①The reaction product enters the reactor, and under the protection of inert gas, under the vacuum of 15~20kPa absolute pressure, add dropwise sodium hydroxide solution with a concentration of 45±0.5% at a temperature of 50~55℃, massage The amount of sodium hydroxide used is 1.7 times the amount of bisphenol A in step ①, the amount of sodium hydroxide is 1.7 times the amount of bisphenol A in step 1, and the epichlorohydrin is kept refluxed for dehydration during the reaction, and the reaction time is 4h;
[0042] ③Removal of the solvent epichlorohydrin: After the reaction in step ② is completed, the epichlorohydrin is recovered by distillation at a temperature of 120°C and a vacuum degree of 10kPa; the remaining small amount of epichlorohydrin is removed by kettle evaporation , The operating pressure is 0.2~0.5...
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