Cellulose and tourmalinite nano crytal compound material, its preparation method and use

A composite material and nanocrystal technology, applied in the field of material science and natural polymer chemistry, can solve the problems of difficulty in preparing related materials, interface incompatibility, lack of adsorption force, etc., and achieve good compatibility of raw materials, low cost, Easy-to-use effects

Inactive Publication Date: 2004-03-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in the force between the molecules of inorganic materials and organic polymers, the incompatibility of the two interfaces and the lack of adsorption force have brought difficulties to the preparation of related materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 10 g of regenerated cellulose was mixed uniformly in a mixed solution of 1.5 M NaOH and 0.65 M thiourea, frozen at -10° C. for 12 hours, then thawed, and filtered to obtain a 5 wt % transparent cellulose solution.

[0017] Adding 0.2 to 3 g of tourmaline nano crystal grains into 20 mL of a mixed solution of 1.5M NaOH and 0.65 M thiourea for sufficient infiltration and activation, and stirring for 8 hours to prepare a suspension dispersion liquid of tourmaline nano crystal grains.

[0018] The above-mentioned cellulose aqueous solution and tourmaline nanocrystal particle suspension dispersion liquid are mixed according to the weight ratio of cellulose: tourmaline nanocrystal particle is 100: 2, 100: 4, 100: 8, 100: 15, 100: 30, Stir vigorously in an ultrasonic environment, filter and degas to obtain a composite slurry, scrape a film on a glass plate, the film thickness is about 0.2-0.3mm, and then immerse in 1-20wt% calcium chloride aqueous solution to solidify for 5 minu...

Embodiment 2

[0020] Staphylococcus aureus is provided by the China Center for Type Culture Collection of Wuhan University. It is a typical bacterium used in biomedical research and has been used to evaluate the antibacterial properties of materials for a long time. The clones of the stripped bacteria were preserved and cultivated at 37°C for 72 hours, and the composite film of cellulose and tourmaline nanocrystals obtained in Example 1 was cut into 1×1cm 2 , and placed in 93% ethanol aqueous solution for 15 minutes and then washed with distilled water. All test instruments were sterilized in an autoclave at 200°C. The composite membrane material was covered on the top of Staphylococcus aureus in the nutrient solution of the petri dish, and the growth of spores on the surface of the membrane material was observed to evaluate its antibacterial performance.

[0021] The antibacterial test results showed that the composite material had antibacterial properties. Spore discs appeared in both t...

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Abstract

The present invention discloses a composite film or fibre material formed from cellulose and tourmaline nano crystal grains, its preparation method and application. Said method uses NaOH / thiourea aqueous solution as solvent to dissolve cellulose, then the dissolved cellulose and the tourmaline nano crystal grain suspension are mixed together according to different mixing ratio, and blade-applied or spray-webbed, and solidified in calcium chloride aqueous solution, and regenerated in hydrochloric acid or sulfuric acid sequence solution so as to obtain the series cellulose composite material. Said invented products have good mechanical property and bacteria-resisting activity, so that have extensive application range.

Description

technical field [0001] The invention relates to a composite material made of cellulose and tourmaline nano crystals and its preparation method and application, which belongs to the field of natural polymer chemistry and also belongs to the field of material science. Background technique [0002] Composites of polymers and inorganic particles have become an extremely attractive field of modern materials science (Maclachian, M.J.; Manners, I.; Ozin, G.A. AdvMater 2000, 12, 675). Composite new materials at the nanometer level or molecular level less than 100 nanometers in at least one dimension are called nanocomposites. Due to the huge specific surface area of ​​nanocrystals, it endows composite materials with many synergistic properties that cannot be reflected in a single component, such as mechanical properties (Giannelis, E.P. Adv Mater 1996, 8, 29), thermal properties (Kojima, Y.; Usuki, A .; Okada, A.J Polym Sci Part A: Polym Chem 1997, 35, 2289), electromagnetic proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/14C08L1/02
Inventor 张俐娜阮东
Owner WUHAN UNIV
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