Modified chitosan-silicon dioxide composite aerogel material as well as preparation method and application thereof
A composite aerogel and silica technology, applied in the field of textile finishing, can solve the problems of thick jacket lining, reduced clothing practicality, good oil absorption performance, etc.
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Embodiment 1
[0038] The present embodiment provides a modified chitosan-silicon dioxide composite airgel material, which is prepared through the following steps:
[0039] (1) Add 100g of trifluoroethanol, 96g of carbonic acid, and 19.6g of sulfuric acid into a 500ml three-neck flask, stir and heat to reflux, keep the temperature at 60°C, react for 10h, filter, and then add 200ml of cyclohexane to the filtrate Extraction. After extraction, add 10.2 g of acetic anhydride to the upper layer solution, stir and heat to reflux at 80° C. for 8 hours, and then distill to obtain white crystalline solid A.
[0040] (2) Add 270g of solid A, 108.16g of benzylamine, and 500ml of ethyl acetate into a 1000ml three-neck flask, heat, stir and reflux at 60°C for 5h, then distill at 80°C to obtain pale yellow needle-like solid B.
[0041] (3) Solid B was roasted at 200°C for 1 hour to obtain solid C, which is the airgel modification additive. The NMR data are as follows:
[0042] 1 H-NMR (400Hz) δ (ppm) 4.22...
Embodiment 2
[0047] The present embodiment provides a chitosan-silicon dioxide composite airgel material, which is prepared through the following steps:
[0048] (1) Add 100 g of trifluoroethanol, 100 g of carbonic acid, and 20 g of sulfuric acid into a 500 ml three-neck flask, stir and heat to reflux, keep the temperature at 65° C., and filter after 12 hours of reaction, then add 200 ml of cyclohexane to the filtrate for extraction. After extraction, 10.5 g of acetic anhydride was added to the upper layer solution, stirred and heated to reflux at 85°C for 10 h, and then distilled to obtain white crystalline solid A.
[0049] (2) Add 280g of solid A, 110g of benzylamine, and 500ml of ethyl acetate into a 1000ml three-neck flask, heat, stir and reflux at 65°C for 5h, then distill at 85°C to obtain light yellow needle-like solid B.
[0050] (3) Calcining solid B at 210° C. for 1 h to obtain solid C, which is the airgel modification aid.
[0051] (4) Heat and stir 95g tetraethyl orthosilicat...
Embodiment 3
[0055] The present embodiment provides a chitosan-silicon dioxide composite airgel material, which is prepared through the following steps:
[0056] (1) Add 100g of trifluoroethanol, 90g of carbonic acid, and 19g of sulfuric acid into a 500ml three-necked flask, stir and heat to reflux, keep the temperature at 60°C, react for 8h, filter, then add 200ml of cyclohexane to the filtrate for extraction, After extraction, 10 g of acetic anhydride was added to the upper layer solution, stirred and heated to reflux at 80° C. for 8 h, and then distilled to obtain white crystalline solid A.
[0057] (2) Add 270g of solid A, 105g of benzylamine, and 500ml of ethyl acetate into a 1000ml three-neck flask, heat, stir and reflux at 60°C for 5h, then distill at 80°C to obtain light yellow needle-like solid B.
[0058] (3) Calcining solid B at 190° C. for 1 h to obtain solid C, which is the airgel modification aid.
[0059] (4) Take 92g tetraethyl orthosilicate, 28g chitosan, 4.5g citric acid...
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