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Chitosan quaternary ammonium salt/organic montmorillonite nano composite material and preparation method thereof

A chitosan quaternary ammonium salt and nano-composite material technology, applied in the field of nano-materials, can solve problems such as composite materials that have not yet appeared, and achieve the effects of good market prospects, enhanced inhibition, and low cost

Inactive Publication Date: 2007-03-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If chitosan quaternary ammonium salt and montmorillonite are combined as antibacterial agent, it will open up a new development direction for antibacterial agent, but there is no inorganic material such as chitosan quaternary ammonium salt and montmorillonite in the prior art. Combined Composite Materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Disperse montmorillonite in distilled water to make a 2% (w / v) suspension. After uniform dispersion, stir at a high speed for 30 minutes to obtain a stable 2% (w / v) montmorillonite suspension. The modifier hexadecyltrimethylammonium bromide was formulated as a 2% (w / v) aqueous solution and heated dropwise to the montmorillonite suspension at 90°C, kept at a constant temperature for 5 hours, filtered with suction, and washed with distilled water several times until Use silver nitrate to detect the absence of bromide ions, and dry to constant weight at 90°C to obtain organic montmorillonite. 0.2g organic montmorillonite is made into a suspension with a w / v ratio of 1%, stirred and heated to 75°C, 0.075g of chitosan quaternary ammonium salt is made into a 0.25% (w / v) aqueous solution, added dropwise In the organic montmorillonite suspension of 1% (w / v), after stirring and reacting for 1d, the remaining chitosan quaternary ammonium salt was made into 0.5% (w / v) c...

Embodiment 2

[0011] Embodiment 2: The preparation method of organic montmorillonite is as in embodiment 1, and the modifier used is octadecyltrimethylammonium chloride. 0.2g organic montmorillonite is made w / v ratio and is 1.5% suspension, stirs and is heated to 80 ℃, the chitosan quaternary ammonium salt of 0.1g (w / v) is made 0.4% (w / v ) aqueous solution, was added dropwise in the suspension of 0.2g organic montmorillonite of 1.5% (w / v), after stirring and reacting for 1.5d, the remaining chitosan quaternary ammonium salt was made into 0.75% (w / v) shell The polysaccharide quaternary ammonium salt solution was added dropwise to the reacting solution, and the stirring was continued for 1.5d. After freeze-drying, the chitosan quaternary ammonium salt / organic montmorillonite nanocomposite material is obtained. The total weight percentage of each component of the composite material is 66.7% of chitosan quaternary ammonium salt and 33.3% of montmorillonite.

Embodiment 3

[0012] Embodiment 3: The preparation method of organic montmorillonite is as in embodiment 1, and the modifier used is didecyl dimethyl ammonium chloride. 0.2g organic montmorillonite is made w / v ratio is 2% suspension, is stirred and heated to 80 ℃, 0.2g chitosan quaternary ammonium salt is made 0.5% (w / v) aqueous solution, is added dropwise to In the suspension of 2% (w / v) 0.2g organic montmorillonite, after stirring and reacting for 2d, the remaining chitosan quaternary ammonium salt was made into 1.0% (w / v) chitosan quaternary ammonium salt aqueous solution dropwise Added to the solution being reacted and continued to stir for 2d. After freeze-drying, the chitosan quaternary ammonium salt / organic montmorillonite nanocomposite material is obtained. The total weight percentage of each component of the composite material is 80% of chitosan quaternary ammonium salt and 20% of montmorillonite.

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Abstract

The present invention discloses one kind of nanometer chitosan quaternary ammonium salt / organic montmorillonite composite material and its preparation process. The composite material consists of chitosan quaternary ammonium salt and organic montmorillonite. It is prepared through twice dropping chitosan quaternary ammonium salt solution into organic montmorillonite suspension at 70-80 deg.c and through stirring, and freeze drying. The nanometer composite material combines the bacterium adsorbing and fixing effect of clay and the bacterium inhibiting and killing effect of chitosan quaternary ammonium salt, so that it has high antibiotic performance, broad antibiotic spectrum and long antibiotic period.

Description

technical field [0001] The invention relates to a chitosan quaternary ammonium salt / organic montmorillonite nanocomposite material and a preparation method thereof, belonging to the technical field of nanomaterials. Background technique [0002] Chitosan is the only alkaline polysaccharide with the most abundant reserves in nature, and it has good biocompatibility and biodegradability. Due to its natural antibacterial properties, it has extensive and unique application value in the fields of medicine, printing and dyeing, chemical industry, food and agriculture. However, chitosan can only be dissolved in acidic conditions, which limits its application. Chitosan quaternary ammonium salt is a water-soluble derivative of chitosan, which has antibacterial properties under acidic, neutral or even alkaline conditions. However, although chitosan and its derivatives have the advantages of safety and non-toxicity as antibacterial agents, compared with inorganic antibacterial agents,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K9/04
Inventor 杜予民王小英
Owner WUHAN UNIV
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