Production method of brominated lignin
A production method and lignin technology, applied in the field of brominated lignin, can solve the problems of large-scale application limitations, poor flame retardancy, low glass transition temperature, etc., achieve low solvent recovery costs, increase bromine content, and heat resistance Improved effect
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Embodiment 1
[0016] Embodiment 1 (corresponding example raw material and proportioning value thereof in comparison table 1): 1 part of lignin is added to reactor, then add 10 parts of organic solvent, stir 2-6 hour, then add 0.5 part of bromine, 0.2 part of hydrogen peroxide, Stir at 30-40°C for 1 hour, pour the above reactant into a water tank filled with 30 parts of water and stir to precipitate brominated lignin, centrifuge and separate the precipitate, and dry to obtain a brominated lignin product with a bromine content of 19%. .
Embodiment 2
[0017] Embodiment 2 (corresponding embodiment raw material and proportioning value thereof in comparison table 1): 1 part of lignin is added to reactor, then add 15 parts of organic solvents, stir 2-6 hour, then add 1 part of bromine, 0.3 part of hydrogen peroxide, Stir at 30-40°C for 1 hour, pour the above reactant into a water tank with 40 parts of water and stir to precipitate the brominated lignin, centrifuge the precipitate, dry it, and obtain a brominated lignin product with a bromine content of 27%. .
Embodiment 3
[0018] Embodiment 3 (corresponding embodiment raw material and proportioning value thereof in comparison table 1): 1 part of lignin is added to reaction kettle, then add 20 parts of organic solvents, stir for 2-6 hours, then add 5 parts of bromine, 0.4 part of hydrogen peroxide, Stir at 30-40°C for 1 hour, pour the above reactant into a water tank filled with 50 parts of water and stir to precipitate brominated lignin, centrifuge and separate the precipitate, and dry to obtain a brominated lignin product with a bromine content of 42%. .
[0019] The rest of Examples 4-8 are prepared in the same way as Example 1 with reference to the raw materials and proportioning values of the corresponding examples in Table 1, among which Examples 1-3 are preferred.
[0020] Lignin reacts with bromine, and bromine can be introduced at the α-position, β-position and the ortho- and para-position of the benzene ring, and the combination of bromine and lignin is stable. Utilizing this princip...
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