A kind of preparation method of polysiloxane ionic liquid cigarette filter additive
An ionic liquid and polysiloxane technology, which is used in e-liquid filter, tobacco, food science and other directions to achieve the effect of good selective removal ability
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Embodiment 1
[0016] 1) Activation of silica gel: Weigh 50 g of silica gel (200-300 mesh) into a 150 mL two-necked flask, add 100 g of hydrochloric acid aqueous solution (mass concentration is 25%), fix the flask on a magnetic stirrer, and connect the stirring blade and Electric stirrer, heated to 90 ° C, stirred for 8 hours, then cooled to room temperature and vacuum filtered. Add an appropriate amount of deionized water to the filter residue, stir and wash repeatedly, filter with suction, and wash until neutral. Put it into an electric blast drying oven (120°C) overnight, then transfer it to a vacuum drying oven (60°C, 8h), dry it and seal it for use.
[0017] 2) the synthesis of imidazole sodium: imidazole 8.04g (0.12mol) is placed in 100mL flask, under N 2 Heated to 90°C for melting under protection, added flaked NaOH 4.05g (0.1mol), and refluxed for 12h. The product was washed three times with tetrahydrofuran and suction-filtered, and the obtained precipitate was dried in a vacuum ov...
Embodiment 2
[0024] 1) Activation of silica gel: Add 1.5 times of 20% hydrochloric acid by weight to silica gel with a particle size of 200 mesh, heat to 80°C, stir magnetically for 12 hours, cool to room temperature and then filter under reduced pressure, add deionized water to the filter residue and wash until Neutral, drying;
[0025] 2) Fixing of polysiloxane ionic liquid: dissolve polysiloxane ionic liquid in ethanol, add activated silica gel, the weight ratio of described activated silica gel and polysiloxane ionic liquid is 1: 1, in N 2 Stir the reaction at 30°C under protection for 5 hours, evaporate the ethanol after stopping the stirring, and continue the reaction under N 2 Heating at 160° C. for 6 hours under protection, after cooling, washing the silica gel with ethanol to remove polysiloxane ionic liquid not fixed on the silica gel, and drying the washed silica gel.
[0026] The preparation method of the polysiloxane ionic liquid is: γ-imidazolyl triethoxysilane, dimethyldiet...
Embodiment 3
[0028] 1) Activation of silica gel: Add 3 times of 30% hydrochloric acid by weight to silica gel with a particle size of 300 mesh, heat to 100° C., stir magnetically for 6 hours, cool to room temperature and filter under reduced pressure, add deionized water to the filter residue and wash until Neutral, drying;
[0029] 2) Fixing of polysiloxane ionic liquid: dissolving polysiloxane ionic liquid in ethanol, adding activated silica gel, the weight ratio of the activated silica gel and polysiloxane ionic liquid is 3: 1, in N 2 Stir the reaction at 50°C under protection for 3 hours, evaporate the ethanol after stopping the stirring, and continue the reaction under N 2 Heating at 200° C. for 2 hours under protection, after cooling, washing the silica gel with ethanol to remove polysiloxane ionic liquid not fixed on the silica gel, and drying the washed silica gel.
[0030] The preparation method of the polysiloxane ionic liquid is: γ-imidazolyl triethoxysilane, dimethyldiethoxysi...
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