Preparation method of modified lignin-based bisphenol monomer
A plain-based bisphenol and lignin-based technology is applied in the field of preparation of modified lignin-based bisphenol monomers to achieve the effects of good mechanical properties, low price and abundant sources
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Embodiment 1
[0016] A preparation method of a modified lignin-based bisphenol monomer, the preparation technical scheme is as follows:
[0017] Described modified lignin-based bisphenol monomer is prepared according to the following scheme:
[0018] According to the number of parts by mass, 125 parts of lignin-based bisphenol, 410 parts of epichlorohydrin, and 1.3 parts of cocatalyst were added to the reactor, vacuumed, and then the air in the reactor was replaced with nitrogen, repeated three times After filling with nitrogen, the temperature of the reaction system was raised to 80 ° C under the protection of nitrogen, and reacted for 8 hours; after the reaction was completed, it was cooled to room temperature, and 430 parts of sodium hydroxide solution with a concentration of 18% and 1.3 parts of co-catalyst were added. After 90 minutes of reaction at room temperature, use 280 parts of ethyl acetate were extracted three times, the combined organic phases were dried with 40 parts of anhyd...
Embodiment 2
[0023] A preparation method of a modified lignin-based bisphenol monomer, the preparation technical scheme is as follows:
[0024] Described modified lignin-based bisphenol monomer is prepared according to the following scheme:
[0025] According to the number of parts by mass, 120 parts of lignin-based bisphenol, 400 parts of epichlorohydrin, and 1.0 parts of cocatalyst were added to the reactor, vacuumed, and then the air in the reactor was replaced with nitrogen, repeated three times After filling with nitrogen, the temperature of the reaction system was raised to 70 ° C under the protection of nitrogen, and reacted for 6 hours; after the reaction was completed, it was cooled to room temperature, and 400 parts of sodium hydroxide solution with a concentration of 16% and 1.0 parts of co-catalyst were added. After 60 minutes of reaction at room temperature, use 250 parts of ethyl acetate were extracted three times, the combined organic phases were dried with 30 parts of anhyd...
Embodiment 3
[0030] A preparation method of a modified lignin-based bisphenol monomer, the preparation technical scheme is as follows:
[0031] Described modified lignin-based bisphenol monomer is prepared according to the following scheme:
[0032] According to the mass parts, 130 parts of lignin-based bisphenols, 420 parts of epichlorohydrin, and 1.5 parts of cocatalysts are added to the reactor, vacuumed, and then the air in the reactor is replaced with nitrogen, repeated three times After filling with nitrogen, the temperature of the reaction system was raised to 90°C under the protection of nitrogen, and reacted for 10 hours; after the reaction was completed, it was cooled to room temperature, and 450 parts of 20% sodium hydroxide solution and 1.5 parts of co-catalyst were added, reacted at room temperature for 120 minutes and used 300 parts of ethyl acetate were extracted three times, the combined organic phases were dried with 50 parts of anhydrous sodium sulfate and filtered, and t...
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