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

Inactive Publication Date: 2010-06-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is no report that it is used to prepare chitosan quaternary ammonium salt / montmorillonite nanocomposite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a method for preparing quaternary chitosan / imvite nanometer composite material under microwave radiation. The method comprises the following steps that: under a condition of microwave radiation, aqueous solution of quaternary chitosan is dripped into imvite suspension; and under the action of shearing force, an interlayer of a quaternary chitosan molecular chain enters the interlayer of the imvite to generate the composite material. In the preparation method under the microwave radiation, the quaternary chitosan / imvite nanometer composite material can be obtained in two hours, which is 12 to 48 times shorter than 24 to 96 hours of the conventional heating method, so that the method improves the reaction efficiency, is 'green' and 'environment-friendly' production technology, and provides feasibility for further industrialization of the quaternary chitosan / imvite nanometer composite material.

Description

technical field [0001] The invention relates to a microwave radiation preparation method of a chitosan quaternary ammonium salt / montmorillonite nanocomposite material, belonging to the field of nanotechnology. Background technique [0002] The basic process of preparing polymer / layered silicate nanocomposites is to insert organic monomers or polymers into the middle of clay sheets, with layered clay as the host and organic monomers or polymers as the guest, using thermodynamics or The chemical action destroys the lamellar structure of the silicate, and then the basic unit of the lamellar structure is stretched or peeled off, and is evenly dispersed in the polymer matrix to realize the composite of the polymer and the silicate lamellar layer at the nanoscale. Thus, nanocomposites are produced. Intercalation composite methods include in-situ polymerization, solution intercalation, emulsion intercalation and melt intercalation. Since chitosan is a natural polymer and is not r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/34C08J3/28
Inventor 王小英刘博孙润仓
Owner SOUTH CHINA UNIV OF TECH
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