Low-viscosity and high-quality liquid bisphenol A type epoxy resin synthesis method
A technology of epoxy resin and synthesis method, which is applied in the field of epoxy resin synthesis, and can solve the problems of high viscosity, high hydrolyzable chlorine content, and low hydrolyzable chlorine content of liquid bisphenol A epoxy resin
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[0025] see figure 1 , the synthetic method of the low viscosity of one embodiment, high-quality liquid bisphenol A type epoxy resin, comprises the following steps:
[0026] Step S110, in a protective gas atmosphere, mix epichlorohydrin, bisphenol A and additives with a mass ratio of 0.81~4.1:1:0.005~0.1, heat to 30°C~80°C, and wait until the bisphenol A is completely After dissolving, add alkali 0.03-0.29 times the amount of bisphenol A substance, and react for 1-5 hours to obtain a reaction solution.
[0027] Wherein, the protective gas is nitrogen, argon, helium or neon.
[0028] Additives are water, ethylene glycol, glycerol, butanone, cyclohexane, cyclohexanone, propylene glycol methyl ether, methyl isobutyl ketone, polyethylene glycol, 18-crown-6 or benzyl trimethyl ammonium chloride.
[0029] The above-mentioned additives are cheap and easy to obtain, can be produced without modifying the production equipment, and are simple and easy to operate.
[0030] Wherein, the...
Embodiment 1
[0052] In a nitrogen atmosphere, mix 228g of epichlorohydrin, 114g of bisphenol A and 3g of glycerol, heat to 50°C, and after the bisphenol A is completely dissolved, add 15g of 20% by mass sodium hydroxide aqueous solution , and reacted for 2 hours to obtain a reaction solution.
[0053] At 55°C, 50kPa, 165g of 20% sodium hydroxide aqueous solution was added dropwise at a constant speed by a peristaltic pump to the above reaction solution, and after 10 hours of reaction, at 200°C, 10kPa, excess epichlorohydrin was removed, to get the mixture.
[0054] Dissolve the above mixture in 200g of toluene, wash with water, separate the liquids, take the organic layer, add 9.5g of 20% sodium hydroxide aqueous solution to the above organic layer at 65°C, react for 2 hours, and then add 1g Cyclohexanone and 23 g of 20% aqueous sodium hydroxide solution were reacted for 4 hours to obtain a reaction mixture.
[0055] At 50°C, the above reaction mixture was washed with water until neutral...
Embodiment 2
[0058] In an argon atmosphere, mix 300g of epichlorohydrin, 114g of bisphenol A and 4g of cyclohexane, heat to 56°C, and after the bisphenol A is completely dissolved, add 9.1g of 35% by mass hydrogen hydroxide Sodium aqueous solution was reacted for 4 hours to obtain a reaction solution.
[0059] At 63°C and 30kPa, 100g of 35% sodium hydroxide aqueous solution was added dropwise through the peristaltic pump at a constant speed in the above reaction solution, and after 7 hours of reaction, at 150°C and 10kPa, excess epichlorohydrin was removed. to get the mixture.
[0060] Dissolve the above mixture in 300g of toluene, wash with water, separate the liquids, take the organic layer, add 9.8g of 35% sodium hydroxide aqueous solution to the above organic layer at 75°C, react for 2 hours, and then add 1g Cyclohexane and 16.5 g of 35% aqueous sodium hydroxide solution were reacted for 4 hours to obtain a reaction mixture.
[0061] At 70°C, the above reaction mixture was washed wit...
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