An ionic liquid covalently bonded immobilized silicon-based material, preparation method and application thereof
An ionic liquid, covalent bonding technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., to achieve the effect of being suitable for large-scale production, low price, and good thermal stability
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[0034] A kind of preparation method of ionic liquid immobilized silicon dioxide provided by the invention comprises the following steps:
[0035] (1) Activate the silicon dioxide, add the activated silicon dioxide to the silane coupling agent solution to carry out the alkylation reaction, after the reaction, suction filter and wash the product to obtain the alkylated dioxide silicon;
[0036] (2) carry out surface modification with alkylated silicon dioxide obtained in step (1), introduce the ionic liquid monomer containing unsaturated double bond, make it and alkylated silicon dioxide take place radiation grafting reaction, to product Suction filtration and washing are carried out to obtain the ionic liquid covalently bonded immobilized silicon dioxide material.
[0037] In some embodiments, the silica has a diameter ranging from 0.05 μm to 1000 μm.
[0038] In some embodiments, the ratio of silicon dioxide to the ionic liquid solution in the radiation grafting reaction sys...
Embodiment 1
[0045] A kind of preparation method of ionic liquid immobilized silicon dioxide is as follows:
[0046] The preparation process is as figure 1 As shown, 10g of silica powder was soaked in 20mL of 6M hydrochloric acid for 24h, washed with deionized water until neutral, and dried. Put 10g of the treated silica, 10mL of 3-(methacryloyloxy)propyltrimethoxysilane, and 90mL of toluene in a 250mL flask, stir and reflux at 120°C for 24h, and wash the obtained product with toluene, ethanol, and water respectively , and dried to obtain alkylated silicon dioxide.
[0047] Put 5g of alkylated silicon dioxide into a polyethylene bag and lay it flat, and vacuum seal it, inject 50mL of 30wt% 1-vinyl-3-ethylimidazolium ionic liquid solution with nitrogen deoxygenation and seal it, and pass through the accelerator Radiation grafting was carried out under the beam, the irradiation dose rate was 20kGy / pass, and the absorbed dose was 160kGy. The obtained product was washed with toluene, ethanol...
Embodiment 2
[0049] Research on the relationship between the grafting rate and dose of the radiation grafting method described in Example 1.
[0050] Weigh 1g of alkylated silica respectively, place them in polyethylene bags and vacuum seal them, and inject 10mL of 1-vinyl-3-ethylimidazole with a concentration of 20wt%, 30wt%, and 40wt% into the polyethylene bags respectively The bromide salt ionic liquid was irradiated to a certain dose at a dose rate of 20kGy / pass, and the mass of the product obtained was weighed to calculate the grafting rate.
[0051] figure 2 It is a graph showing the relationship between the grafting rate and the dosage of the ionic liquid immobilized silicon dioxide prepared in the present invention. It can be seen that the grafting rate has an overall trend of increasing with the increase of the absorbed dose and concentration. When the concentration is too high, more homopolymers will be produced during the irradiation process, which will affect the further incr...
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