Chitosan/rectorite nano composite materials and method for preparing the same

A nano-composite material and rectorite technology, which is applied in the field of chitosan/rectorite nano-composite materials and their preparation, can solve the problems of lack of sterilization or bacteriostasis, and achieve prolonged antibacterial time, improved heat resistance, The effect of antibacterial performance improvement

Inactive Publication Date: 2006-06-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural clay itself often does not have bactericidal or bacteriostatic functions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Add 4 g of rectorite to 20 ml of distilled water, and after uniform dispersion, stir at high speed for 30 minutes to obtain a stable rectorite suspension. Mix 5g of cetyltrimethylammonium bromide into a 2% (w / v) aqueous solution and heat it dropwise to the rectorite suspension at 90°C, keep the temperature for 5h, filter it with suction, and wash it with distilled water several times until it is dissolved in nitric acid. Silver detected no bromide ions, and dried at 90°C to constant weight to obtain organic rectorite. 1g chitosan was dissolved in 1.5% (v / v) acetic acid to form 0.5% (w / v) chitosan acetic acid solution, stirred for 3h, added dropwise to 1g organic rectorite suspension, stirred and heated to After reacting at 55°C for 1 day, prepare 1 g of chitosan solution according to the total concentration of 1.5% (w / v), add it dropwise to the reacting solution, and continue stirring for 1 day. Precipitate the reactant with 1mol / L NaOH, wash with distilled ...

Embodiment 2

[0012] Embodiment 2: organic rectorite preparation method sees embodiment 1. 1g chitosan is dissolved in 1.2% (v / v) acetic acid and is made into the chitosan acetic acid solution of 0.8% (w / v), stirs 3.5h, Add dropwise to 1g of organic rectorite suspension, stir and heat to 60°C, after 1.5 days of reaction, prepare 5g of chitosan solution at 2% (w / v) of the total concentration, and add dropwise to the reacting solution In, continue stirring for 1.5d. The reactant was precipitated with 1.5mol / L NaOH, washed with distilled water until neutral, and dried at 55°C. A composite material is obtained.

Embodiment 3

[0013] Embodiment 3: see embodiment 1 for the preparation method of organic rectorite. 1g chitosan is dissolved in 1% (v / v) acetic acid and is made into the chitosan acetic acid solution of 0.5% (w / v), stirs 4h, drops Add it to 1g of organic rectorite suspension, stir and heat to 60°C, after 2 days of reaction, prepare 11g of chitosan solution according to the total concentration of 2.5% (w / v), add it dropwise to the reacting solution, Stirring was continued for 1.5d. Precipitate the reactant with 1mol / L NaOH, wash with distilled water until neutral, and dry at 50°C. A composite material is obtained.

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PUM

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Abstract

The invention discloses the method for preparation of chitosan/rectorite nano composite material used for antibacterial agent. The chitosan/rectorite nano composite material, which mainly comprises chitosan and rectorite, is made by entering chitosan intercalation into clay band. The method comprises the following steps: carrying out base exchange by natural rectorite and modifier to make organic rectorite, in the condition of stirring, adding the chitosan solution into the organic rectorite suspending liquid at twice, adding caustic soda solution, washing the solution until the neutral solution, drying, and getting the chitosan or rectorite nano composite material. Compared with the pure chitosan, the microorganism resistance and fire-resisting property of chitosan or rectorite nano composite material are better.

Description

technical field [0001] The invention relates to a chitosan / rectorite nanocomposite material used as an antibacterial agent and a preparation method thereof. Background technique [0002] Chitosan is a natural antibacterial agent, which can inhibit the growth of various bacteria and fungi, and has the advantages of high sterilization rate, low toxicity, good biocompatibility and no antigenicity. Its research and development are attractive. prospects and a broad market. However, due to its difficult processing, poor stability and heat resistance, its application in many fields is limited. [0003] Currently, polymer / layered silicate nanocomposites have attracted much attention due to the combination of structural, physical and chemical properties of organic and inorganic materials. Due to the nano-size effect and strong interfacial interaction, the nanocomposite has excellent heat resistance and good processability. At the same time, layered silicate has a large specific su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08A01N31/00C08K3/34
Inventor 杜予民王小英罗继文
Owner WUHAN UNIV
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