Method for preparing quaternary chitosan/imvite nanometer composite material under microwave radiation
A technology of chitosan quaternary ammonium salt and nanocomposite materials, which is applied in the nanometer field to achieve good antibacterial and drug controlled release performance, strong operability and wide application prospects
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Embodiment 1
[0010] Example 1: 0.05g of montmorillonite was made into a 1g / ml aqueous suspension, and after swelling for 18h, it was placed in a microwave radiation instrument, its output power was adjusted to 700w, the temperature was 70°C, and the concentration of 0.0125g was 0.1g / ml chitosan quaternary ammonium salt (weight average molecular weight is 1.5×10 5 , degree of substitution is 75%) aqueous solution is added dropwise in the montmorillonite water suspension and reacted for 30min, then 0.0125g 0.5g / ml chitosan quaternary ammonium salt aqueous solution is added dropwise in the solution of reaction, continue stirring (700 rpm / min) 1.25h, freeze-dried to obtain the chitosan quaternary ammonium salt / montmorillonite nanocomposite. The total weight percentage of each component of the composite material is 33.3% of chitosan quaternary ammonium salt and 66.7% of montmorillonite. The interlayer spacing of montmorillonite in the material is 2.12nm, while the interlayer spacing of montm...
Embodiment 2
[0011] Example 2: 0.05g of montmorillonite was made into a 1.5g / ml aqueous suspension, and after swelling for 24 hours, it was placed in a microwave radiation instrument, its output power was adjusted to 600w, the temperature was 75°C, and the concentration of 0.0125g was 0.15 g / ml chitosan quaternary ammonium salt (weight average molecular weight is 1.3×10 5 , degree of substitution is 85%) aqueous solution was added dropwise in the montmorillonite water suspension and reacted for 20min, then 0.0375g0.5g / ml chitosan quaternary ammonium salt aqueous solution was added dropwise in the solution of reaction, continued to stir for 1h (600 RPM), freeze-dried to obtain the chitosan quaternary ammonium salt / montmorillonite nanocomposite. The total weight percentage of each component of the composite material is 50% of chitosan quaternary ammonium salt and 50% of montmorillonite. The interlayer spacing of montmorillonite in the material is 2.23nm, while the interlayer spacing of mont...
Embodiment 3
[0012] Example 3: 0.05g of montmorillonite was made into a 1.5g / ml aqueous suspension, and after swelling for 36h, it was placed in a microwave radiation instrument, its output power was adjusted to 500w, the temperature was 75°C, and the concentration of 0.025g was 0.2 g / ml chitosan quaternary ammonium salt (weight average molecular weight is 1.1×10 5 , degree of substitution is 95%) aqueous solution was added dropwise in the montmorillonite aqueous suspension and reacted for 15min, then 0.075g0.75g / ml chitosan quaternary ammonium salt aqueous solution was added dropwise in the solution of reaction, continued to stir for 1.5h ( 1000 rpm), freeze-dried to obtain the chitosan quaternary ammonium salt / montmorillonite nanocomposite. The total weight percentage of each component of the composite material is 66.7% of chitosan quaternary ammonium salt and 33.3% of montmorillonite. The interlayer spacing of montmorillonite in the material is 2.25nm, while the interlayer spacing of m...
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