Chitosan polyamine derivative-silver supported nanometer titanium dioxide composite material
A technology of nano-titanium dioxide and chitosan polyamine, which is applied in the field of preparation of chitosan polyamine derivatives-silver-loaded nano-titanium dioxide composite materials, can solve the problems of no chemical modification of chitosan, and achieve improved application value and stability Good, broad-spectrum effect
Examples
Embodiment 1
[0018] Preparation of 1,3-dibromopropaneethylenediamine chitosan-silver loaded nano-titanium dioxide composites
[0019] 1. Preparation of ethylenediamine derivatized products of chitosan
[0020] 1), deep deacetylation of chitosan
[0021] The method is carried out according to the published report (Jiang Tingda, Chitosan, Chemical Industry Press, 2001: 73), and the obtained product is vacuum-dried at 60°C.
[0022] 2), the benzaldehyde protection of the amino group of chitosan
[0023] This method is carried out according to the published report (Belalia R. et al. J Agric. Food Chem., 2008, 56: 1582-1588), and the obtained product is filtered under reduced pressure at room temperature, washed three times with a mixture of ethanol and water, 60 ℃ vacuum drying.
[0024] 3), 1,3-dibromopropane derivatization of benzaldehyde-protected chitosan
[0025] Dissolve 6.5mL of 1,3-dibromopropane in 60mL of DMF, stir at 40°C, add 2.5g of benzaldehyde chitosan to the mixed solution ...
Embodiment 2
[0034] Preparation of Diethylenetriamine Derivatized Product of Chitosan-Silver-loaded Titanium Dioxide Composite
[0035] 1. Preparation of ethylenetriamine derivatized products of chitosan
[0036] 1), the preparation of 1,3-dibromopropane chitosan
[0037] The preparation method of 1,3-dibromopropane benzaldehyde chitosan is as described in process 1-3 in part (1) of Example 1.
[0038] 2), the preparation of the diethylenetriamine of benzaldehyde protection
[0039] Add the mixture of 19mL of benzaldehyde and 5mL of ethanol into the flask, and after magnetically stirring in an oil bath at 40°C for 0.5h, start to add the mixture of 10mL of diethylenetriamine and 5mL of ethanol dropwise with a constant pressure dropping funnel, and stir for 6h at constant temperature Afterwards, the reaction temperature was lowered to 20° C., and the ethanol was distilled off with a rotary evaporator, and the remaining mixture was prepared for the next reaction.
[0040] 3), the reaction of...
Embodiment 3
[0045] Preparation of triethylenetetramine derivatized product of chitosan-silver-loaded nano-titanium dioxide composite
[0046] 1. Preparation of triethylenetetramine derivatized products of chitosan
[0047] 1), the preparation of 1,3-dibromopropane chitosan
[0048] The preparation method of 1,3-dibromopropane benzaldehyde chitosan is as described in process 1)-3) in part (1) of Example 1.
[0049] 2), preparation of triethylenetetramine protected by benzaldehyde
[0050] Add the mixture of 15mL of benzaldehyde and 5mL of ethanol into the flask, stir at 40°C for 0.5h, start to add the mixture of 10mL of triethylenetetramine and 5mL of ethanol dropwise with a constant pressure dropping funnel, stir and react at constant temperature for 12h, then reduce the reaction The temperature was brought to 20°C, and the ethanol was distilled off with a rotary evaporator, and the remaining mixture was used for the next reaction.
[0051] 3), the reaction of 1,3-dibromopropane deriva...
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Description
Claims
Application Information
- IPC
- C08L5/08; C08K3/22; C08K3/08; C08B37/08
- Inventors
- 汪中明; 吴娜