Rapid preparation method of totally-biodegradable composite membrane with nanometer silver on surface

A surface-loaded, nano-silver technology, applied in coatings and other directions, can solve the problems of low degree of binding of cellulose nano-crystal reduction points, nano-silver can not really play an antibacterial effect, and the antibacterial effect of Staphylococcus aureus is weakened. The preparation process is simple and controllable, the synergistic enhancement effect is improved, and the particle size is controllable.

Inactive Publication Date: 2013-12-25
ZHEJIANG SCI-TECH UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

These two methods have high production requirements and complicated preparation process. The former lacks the reduction point on the surface of cellulose nanocrystals, the degree of bonding is not high, and the dispersion is poor. In addition, the thermal stability is also poor. The latter not only weakens the cellulose nanocrystals to the material. The effect is enhanced and the antibacterial effect against Staphylococcus aureus is also weakened, while the raw material of sodium borohydride is toxic
In addition, our research group previously used a method of ultrasonic blending of nano-silver / cellulose nanocrystalline composite particles and biodegradable polymers to prepare a fully biodegradable composite film filled with nano-silver cellulose nanocomposite particles. However, the nano-silver partially embedded in the composite film prepared by this method cannot really play an antibacterial role (application number 201310262255.0)

Method used

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  • Rapid preparation method of totally-biodegradable composite membrane with nanometer silver on surface
  • Rapid preparation method of totally-biodegradable composite membrane with nanometer silver on surface

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Bamboo fibers were added to formic acid / hydrochloric acid solution, the solid-to-liquid ratio of bamboo fibers to the mixed acid aqueous solution was 1:60 g / mL, and the volume ratio of formic acid (9 mol / L) to hydrochloric acid (5 mol / L) in the mixed acid aqueous solution was 6:1, the mixed solution was reacted at 50 ℃ for 12 h, and after the reaction was completed, the reaction product was washed with deionized water until it was neutralized to obtain the aldylated cellulose nanocrystals; under ultrasonic stirring, the aldylated cellulose nanocrystals Crystals are added to a chloroform solution in which polypropylene carbonate is dissolved, wherein the mass ratio of cellulose nanocrystals to polypropylene carbonate is 20:80; the cellulose nanocrystals / polypropylene carbonate of aldehydes The mass fraction of the ester in its chloroform solution is 30%, to obtain a mixed solution; the above mixed solution is directly coated on a glass plate, and after the product is dried...

Embodiment 2

[0033] Add the hemp fiber to the glyoxylic acid / sulfuric acid solution, where the solid-to-liquid ratio of the hemp fiber to the mixed acid aqueous solution is 1:40 g / mL, and the glyoxylic acid (3 mol / L) and sulfuric acid (10 mol / L) in the mixed acid aqueous solution The volume ratio of the mixture was 8:1, and the mixture was reacted at 70 °C for 14 h. After the reaction, the reaction product was washed with deionized water until it was neutral, and aldehyde-formed cellulose nanocrystals were obtained; under ultrasonic stirring, the aldehyde-formylated The cellulose nanocrystal is added in the dichloromethane solution that is dissolved with polybutene succinate, wherein the mass ratio of the cellulose nanocrystal of formylation and polybutene succinate is 15:85; The mass fraction of prime nanocrystal / polybutylene succinate in its dichloromethane solution is 27%, and the mixed solution is obtained; the above-mentioned mixed solution is directly coated on a glass plate, and afte...

Embodiment 3

[0035] Add cotton to the hexuronic acid / nitric acid solution, where the solid-to-liquid ratio of cotton to the mixed acid solution is 1:20 g / mL, and the glyoxylic acid (6 mol / L) and sulfuric acid (2 mol / L) in the mixed acid solution The volume ratio of the mixture was 7:1, and the mixture was reacted at 80 °C for 11.5 h. After the reaction was completed, the reaction product was washed with deionized water until it was neutral, and an aldylated cellulose nanocrystal was obtained; under ultrasonic stirring, the aldylated The cellulose nanocrystals of cellulose are added in the acetone solution that is dissolved with polycaprolactone, wherein the mass ratio of the cellulose nanocrystals of aldylation and polycaprolactone is 12:88; The cellulose nanocrystals of aldylation / polycaprolactone The mass fraction of lactone in its acetone solution is 10% to obtain a mixed solution; the above mixed solution is directly coated on a glass plate, and after the product is dried, a spray devic...

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Abstract

The invention relates to a rapid preparation method of a totally-biodegradable composite membrane with nanometer silver on the surface. The rapid preparation method comprises the following steps of (1) adding a cellulose raw material to a mixed acid aqueous solution of organic acid and inorganic acid, reacting for 3-15 hours at 40-80 DEG C, after ending reaction, washing a reaction product by using deionized water to be neutral, thus obtaining hydroformylation cellulose nanocrystallines; (2) under the condition of stirring, adding the hydroformylation cellulose nanocrystallines to an organic solution in which a biodegradable polymer is dissolved, thus obtaining mixed liquor; and (3) directly coating the mixed liquor on a glass plate, drying a product, directly spraying a silver ion solution by using a spraying device, and drying at a room temperature so as to obtain the totally-biodegradable composite membrane with the nanometer silver on the surface. The rapid preparation method has the advantages that the preparation technology is simple, rapid, low-cost, high-efficiency and suitable for industrialization volume production; and the obtained multifunctional composite membrane is biodegradable and has an obvious and lasting antibacterial effect, excellent mechanical and thermal property and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of novel multifunctional fully biodegradable composite film and its preparation, and in particular relates to a rapid preparation method of surface loaded nano-silver fully biodegradable composite film. Background technique [0002] With the progress of the times, food quality and safety issues are getting more and more attention from food companies and consumers. Although the traditional polyethylene food preservation film can isolate the contamination of food by external bacteria, it cannot prevent bacteria from multiplying inside the packaged food. At the same time, this type of polyethylene packaging material degrades slowly under natural conditions. Nowadays, this type of plastic The use of plastic wrap has caused some pollution to the environment, and there is an urgent need for a biodegradable substitute. Due to its 100% biodegradability and good biocompatibility, biodegradable polymer materials show fascinati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08L67/02C08L69/00C08L67/04C08L71/08C08L1/04C08B15/08C08B15/02
Inventor 余厚咏孙斌王怡博姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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