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Fully-biodegradable composite membrane filled with nano silver/cellulose nanocrystal composite particles, and preparation method thereof

A nanocrystalline composite and biodegradable technology, which is applied in the field of new multifunctional fully biodegradable composite films and its preparation, can solve the problem that the antibacterial effect of Staphylococcus aureus is not obvious, achieve improved mechanical and thermal properties, and wide application Foreground, performance-enhancing effect

Inactive Publication Date: 2014-01-01
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained composite material not only has significantly enhanced mechanical properties, but also slightly improved thermal properties, but the antibacterial effect of the material on Staphylococcus aureus is not obvious, and the highest antibacterial rate is 87.7%

Method used

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  • Fully-biodegradable composite membrane filled with nano silver/cellulose nanocrystal composite particles, and preparation method thereof
  • Fully-biodegradable composite membrane filled with nano silver/cellulose nanocrystal composite particles, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add microcrystalline cellulose to formic acid / hydrochloric acid solution, wherein the solid-to-liquid ratio of microcrystalline cellulose and mixed acid aqueous solution is 1:60 g / mL, and formic acid (9 mol / L) and hydrochloric acid (5 mol / L) in mixed acid aqueous solution The volume ratio of the mixture is 6:1, and the mixed solution is reacted at 48 ℃ for 12 h. After the reaction is completed, the reaction product is washed with deionized water until it is neutral to obtain aldylated cellulose nanocrystals; In the silver nitrate solution of L, the solid-to-liquid ratio of cellulose nanocrystals and silver nitrate solution was 1:200 g / mL, and the mixed solution was reacted at 92 °C for 20 min. After natural cooling, it was diluted with deionized water. The reaction product is centrifuged several times to remove inorganic ions, and then the dispersion is vacuum-dried to obtain nano-silver / cellulose nano-crystal composite particles;

[0022] Slowly add nano-silver / cellulo...

Embodiment 2

[0026] Add wood pulp into formic acid / hydrochloric acid solution, wherein the solid-to-liquid ratio of wood pulp and mixed acid aqueous solution is 1:80 g / mL, and the volume ratio of formic acid (8 mol / L) to hydrochloric acid (6 mol / L) in mixed acid aqueous solution is 6:1, the mixed solution was reacted at 42 °C for 15 h. After the reaction was completed, the reaction product was washed with deionized water until neutral to obtain aldylated cellulose nanocrystals; then added 0.5 mol / L silver nitrate In the solution, the solid-to-liquid ratio of the aldylated cellulose nanocrystals to the silver nitrate solution was 1:100 g / mL, and the mixed solution was reacted at 60 °C for 30 min. After natural cooling, the reaction product was diluted with deionized water. Centrifuge once to remove inorganic ions, and then vacuum-dry the dispersion to obtain nano-silver / cellulose nanocrystalline composite particles;

[0027] Slowly add nano-silver / cellulose nanocrystalline composite particl...

Embodiment 3

[0031] Bamboo fiber was added to formic acid / hydrochloric acid solution, the solid-to-liquid ratio of bamboo fiber to the mixed acid aqueous solution was 1:20 g / mL, and the volume ratio of formic acid (3 mol / L) to hydrochloric acid (8 mol / L) in the mixed acid aqueous solution was 6:1, the mixture was reacted at 40 °C for 5 h, and after the reaction was completed, the reaction product was washed with deionized water until it was neutral, and the aldylated cellulose nanocrystals could be obtained; then 2 mol / L silver nitrate was added to it In the solution, the solid-to-liquid ratio of the aldylated cellulose nanocrystals to the silver nitrate solution was 1:400 g / mL, and the mixed solution was reacted at 80 °C for 45 min. After natural cooling, the reaction product was diluted with deionized water. Centrifuge once to remove inorganic ions, and then vacuum-dry the dispersion to obtain nano-silver / cellulose nanocrystalline composite particles;

[0032] Slowly add nano-silver / cell...

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Abstract

The invention relates to a preparation method of a fully-biodegradable composite membrane filled with nano silver / cellulose nanocrystal composite particles. The fully-biodegradable composite membrane comprises a biodegradable polymer, and the nano silver / cellulose nanocrystal composite particles, and the mass ratio of the biodegradable polymer to the nano silver / cellulose nanocrystal composite particles is 4-99:1. The preparation method comprises following steps: cellulose is added into a formic acid / hydrochloric acid mixed acid solution, and aldehyde group modified cellulose nanocrystals are obtained after reaction; the aldehyde group modified cellulose nanocrystals are added into silver nitrate solution so as to obtain the nano silver / cellulose nanocrystal composite particles; the nano silver / cellulose nanocrystal composite particles are added into a solution of the biodegradable polymer so as to obtain a mixed solution; and the mixed solution is subjected to direct coating on a glass plates, and products are dried so as to obtain the fully-biodegradable composite membrane filled with the nano silver / cellulose nanocrystal composite particles. The preparation method is simple and convenient, is low in cost and high in efficiency, and is suitable for industrialized batch production; the multi-functional membrane is degradable, and is excellent in mechanical and thermal properties; antibacterial effect is excellent and lasts long; and application prospect is promising.

Description

technical field [0001] The invention belongs to the field of novel multifunctional fully biodegradable composite film and its preparation, in particular relates to a fully biodegradable composite film filled with nano silver / cellulose nano crystal composite particles and a preparation method thereof. Background technique [0002] Biodegradable polyesters (such as polyhydroxybutyrate valerate (PHBV), polylactic acid (PLA), etc.) have broad application potential in biomedical materials, film materials, disposable products, packaging materials, etc. However, due to structural defects, pure biodegradable polyester materials still have defects such as poor mechanical properties, low heat distortion temperature, and slow crystallization rate (CN102493021A; CN101927033A), which limits its further application. In recent years, cellulose nanocrystals have been successfully used in biodegradable polymers due to their high strength and high modulus (Young's modulus as high as 150 GPa),...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L71/08C08L1/10C08K3/08
Inventor 余厚咏秦宗益张勇姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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