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Nano silver/lignin composite antibacterial material and preparation method thereof

A composite antibacterial and nano-silver technology, applied in the fields of botanical equipment and methods, chemicals for biological control, animal repellants, etc., can solve the problems of instability and easy degradation of the carrier, and achieve good stability and high efficiency. The effect of antibacterial ability and good application prospect

Inactive Publication Date: 2015-11-04
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing composite nano-silver antibacterial materials use polysaccharide polymers such as starch, cellulose, hemicellulose and chitosan as immobilized carriers, but these polysaccharide polymers are the source of carbon source for microbial growth, that is, at a suitable temperature and In a humid environment, these polysaccharide polymers will be degraded and utilized by microorganisms, resulting in the problem that the carrier of composite nano-silver antibacterial materials is easily degraded and unstable during the application process.

Method used

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  • Nano silver/lignin composite antibacterial material and preparation method thereof
  • Nano silver/lignin composite antibacterial material and preparation method thereof
  • Nano silver/lignin composite antibacterial material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 0.6mL of 0.5mol / L polyvinyl alcohol aqueous solution, add it to the aqueous solution containing 0.04mol silver nitrate and 0.08mol ammonia water, stir and mix well to obtain a mixed solution; take 5g of formic acid pulping lignin, under 20KHz ultrasonic conditions, add Add 10 mL of 4 mol / L ascorbic acid aqueous solution or 10 mL of 4 mol / L sodium borohydride aqueous solution dropwise to the aforementioned mixed solution, pass nitrogen gas for 30 min, then add dropwise, react under nitrogen protection, 45°C, 20KHz ultrasonic conditions for 30 min, and centrifuge (3000g× 5min), discard the supernatant, wash the precipitate with a mixed solution of ethanol-water (volume ratio 3:1) until no AgCl is formed in the washing solution tested with a chlorine-containing reagent, dry in vacuum at 60°C, and pulverize to obtain a nano-silver / lignin composite antibacterial Material.

[0020] The scanning electron microscope figure and the transmission electron microscope figure of...

Embodiment 2

[0022] Take 0.6mL of 0.5mol / L polyvinyl alcohol aqueous solution, add it to the aqueous solution containing 0.06mol silver nitrate and 0.12mol ammonia water, stir and mix well to obtain a mixed solution; take 6g of formic acid pulping lignin, under 20KHz ultrasonic conditions, add Add 10 mL of 12 mol / L aqueous solution of ascorbic acid or 10 mL of 12 mol / L sodium borohydride solution dropwise into the aforementioned mixed solution, pass nitrogen gas for 30 min, and then add 10 mL of 12 mol / L aqueous solution of sodium borohydride, react under nitrogen protection, 45°C, and 20KHz ultrasonic conditions for 90 min, centrifuge (3000g× 5min), discard the supernatant, wash the precipitate with a mixed solution of ethanol-water (volume ratio 3:1) until no AgCl is formed in the washing solution tested with a chlorine-containing reagent, dry in vacuum at 60°C, and pulverize to obtain a nano-silver / lignin composite antibacterial Material.

[0023] It was determined that the average part...

Embodiment 3

[0025] Take 0.5mL of 0.5mol / L polyvinyl alcohol aqueous solution, add it to the aqueous solution containing 0.08mol silver nitrate and 0.16mol ammonia water, stir and mix to obtain a mixed solution; take 6g of formic acid pulping lignin, under 20KHz ultrasonic conditions, add Add 10 mL of 24 mol / L ascorbic acid aqueous solution or 10 mL of 24 mol / L sodium borohydride aqueous solution dropwise into the aforementioned mixed solution, pass nitrogen gas for 30 min, add dropwise, react under nitrogen protection, 45 ° C, 20 KHz ultrasonic conditions for 100 min, and centrifuge (3000 g× 5min), discard the supernatant, wash the precipitate with a mixed solution of ethanol-water (volume ratio 3:1) until no AgCl is formed in the washing solution tested with a chlorine-containing reagent, dry in vacuum at 60°C, and pulverize to obtain nano-silver / lignin composite nano Silver antibacterial material.

[0026] It was determined that the average particle size of the nano-silver / lignin compos...

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Abstract

The invention discloses a nano-silver / lignin composite antibacterial material. The nano-silver / lignin composite antibacterial material is formed by adsorbing nano-silver particles to the surface of solvent pulping lignin. The particle size distribution range of the nano-silver / lignin composite antibacterial material is 25-75nm, and the nano-silver / lignin composite antibacterial material has efficient antibacterial ability; the antibacterial rate of escherichia coli within 2 hours is greater than 75 percent; meanwhile, the lignin has the characteristics of high biocompatibility, high thermal stability, non-likeliness to be degraded by environmental microorganisms, and the like, so that the problems of degradability and instability of a carrier during the using process of a plurality of existing composite nano-silver antibacterial materials with a polysaccharide polymer as the carrier are solved, and the lignin is high in micro-biological degradation resistance and high in stability; in addition, the lignin is the second largest renewable resource in nature after cellulose, and has the advantages of rich resources, wide source and low cost, so that the nano-silver / lignin composite antibacterial material has a potential and great application prospect in the fields of textile, coatings, medicine and health, articles for daily use, outer food packing and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and antibacterial materials, and relates to a composite nano silver antibacterial material. Background technique [0002] Nano-silver refers to metallic silver particles with a particle size of nanometer (such as 0.2-100nm), which has surface effect, quantum size effect and volume effect. Nano-silver antibacterial material is a kind of inorganic antibacterial material with high safety, broad-spectrum antibacterial ability and excellent heat resistance. It is suitable for textiles, coatings, medicine and hygiene, daily necessities and food packaging and other fields. However, in the process of preparing pure nano-silver, due to its high surface energy, particle aggregation is prone to occur and affect its antibacterial effect. How to uniformly and dispersedly immobilize nano-silver particles on a suitable carrier and exert the unique antibacterial effect of silver nano-particles is a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N59/16A01N25/10A01P1/00
Inventor 钟金锋覃小丽徐立郑炯张甫生
Owner SOUTHWEST UNIV