A kind of preparation method of γ-valerolactone/glycerol system high-yield lignin micro-nanospheres
A technology of micro-nanospheres and lignin, which is applied to the preparation of microspheres, microcapsule preparations, etc., can solve the problems of cumbersome preparation process, time-consuming, poor uniformity of lignin micro-nanospheres, etc., and achieves small size, large specific surface area, The effect of good diffusivity
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Embodiment 1
[0011] Weigh a certain amount of alkali lignin, add it into the GVL solution according to the solid-to-liquid ratio of 1:50 (m / v), and stir to dissolve all the lignin. According to the ratio of GVL to glycerin of 1:5, the above solution was added to glycerin to divide into two layers. Raise the temperature to 60°C, GVL and glycerin are miscible, and stir magnetically for 10 minutes. After the reaction, lower the temperature to room temperature, add water to disperse lignin micronanospheres according to the ratio of mixed solvent and water (v / v) of 1:5, and centrifuge at high speed to obtain lignin micronanospheres with uniform particle size.
Embodiment 2
[0013] A certain quality of kraft lignin was weighed and added into the GVL solution according to the solid-liquid ratio of 1:100 (m / v) to dissolve all the lignin. According to the ratio of GVL to glycerol of 1:10, the above solution was added to glycerin and divided into two layers. The temperature was raised to 80°C, GVL was mixed with glycerol, and OP-10 with a mass fraction of 8% relative to lignin was added, and magnetically stirred for 20 minutes. After the reaction, lower the temperature to room temperature, add water to disperse lignin micronanospheres according to the ratio of mixed solvent and water 1:10 (v / v), and centrifuge at high speed to obtain lignin micronanospheres with uniform particle size.
Embodiment 3
[0015] Weigh a certain mass of organic solvent lignin, and add it into the GVL solution according to the solid-liquid ratio of 1:40 (m / v), so that all the lignin is dissolved. According to the ratio of GVL to glycerol of 1:10, the above solution was added to glycerin and divided into two layers. The temperature was raised to 60°C, GVL was mixed with glycerol, and Span 80 with a mass fraction of 5% of lignin was added, and magnetically stirred for 30 minutes. After the reaction, lower the temperature to room temperature, add water to disperse lignin micronanospheres according to the ratio of mixed solvent and water (v / v) of 1:6, and centrifuge at high speed to obtain lignin micronanospheres with uniform particle size.
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