Low-viscosity bisphenol A epoxide resin and production method thereof
A technology of epoxy resin and production method, which is applied in the field of bisphenol A epoxy resin and its production, can solve the problems of unrecorded product specific parameters and insurmountable problems, achieve excellent storage stability, reduce failure maintenance rate, good Effect of molding performance
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Embodiment 1
[0026] ①Pre-reaction: bisphenol A, epichlorohydrin and Na 2 CO 3 Mix at a molar ratio of 1:6 to 8:0.12, and react at a temperature of 60 to 65°C for 1 hour;
[0027] ②Reaction: Step ① The reaction product enters the reaction kettle, under the condition of inert gas protection, the absolute pressure is 15 ~ 20kPa under vacuum, and the concentration is 40 ± 0.5% sodium hydroxide solution is added dropwise at 50 ~ 55 ° C, hydrogen The amount of sodium oxide is 1. times (molar ratio) of the amount of bisphenol A in the step 1. During the reaction, keep epichlorohydrin reflux dehydration, and the reaction time is 2h;
[0028] ③Removal of 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 of 10kPa; the remaining small amount of epichlorohydrin is removed by kettle evaporation , operating pressure 0.2 ~ 0.5Kpa (absolute pressure), operating temperature 120 ~ 130 ℃;
[0029] ④ R...
Embodiment 2
[0033] ①Pre-reaction: bisphenol A, epichlorohydrin and Na 2 CO 3 Mix at a molar ratio of 1:6 to 8:0.12, and react at a temperature of 60 to 65°C for 1 hour;
[0034] ②Reaction: Step ①The reaction product enters the reaction kettle, under the condition of inert gas protection, the absolute pressure is 15~20kPa under vacuum, and the concentration is 55±0.5% sodium hydroxide solution is added dropwise at the temperature of 50~55℃, hydrogen The amount of sodium oxide is 3 times (molar ratio) of the amount of bisphenol A in the step 1. During the reaction, keep epichlorohydrin reflux dehydration, and the reaction time is 2h;
[0035] ③Removal of 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 of 10kPa; the remaining small amount of epichlorohydrin is removed by kettle evaporation , operating pressure 0.2 ~ 0.5Kpa (absolute pressure), operating temperature 120 ~ 130 ℃;
[0...
Embodiment 3
[0040] ①Pre-reaction: bisphenol A, epichlorohydrin and Na 2 CO 3 Mix at a molar ratio of 1:6 to 8:0.12, and react at a temperature of 60 to 65°C for 1.5 hours;
[0041] ②Reaction: Step ①The reaction product enters the reaction kettle, and under the protection of inert gas, the absolute pressure is 15-20kPa under vacuum, and the sodium hydroxide solution with a concentration of 45±0.5% is added dropwise at a temperature of 50-55°C. The sodium oxide consumption is step 1. 1.7 times (mol ratio) of bisphenol A consumption, keeps epichlorohydrin reflux dehydration during reaction, reaction time 4h;
[0042] ③Removal of 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 of 10kPa; the remaining small amount of epichlorohydrin is removed by kettle evaporation , operating pressure 0.2 ~ 0.5Kpa (absolute pressure), operating temperature 120 ~ 130 ℃;
[0043] ④ Refining reaction: A...
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Abstract
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