Preparation method for cellulose based nano silver composite material

A composite material and cellulose-based technology, which is applied in the field of preparation of cellulose-based nano-silver composite materials, can solve problems such as the potential threat of nano-silver and the limitations of cellulose, and achieve stable properties, simple preparation process, and abundant raw material sources. Effect

Active Publication Date: 2015-03-11
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of preparation method of cellulose-based nano-silver composite mat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of cellulose-based nano-silver composite material, according to the following steps:

[0016] 1. Preparation of carboxylated modified cellulose aqueous dispersion: weigh 1g microcrystalline cellulose, 0.03g TEMPO, 1.08g NaClO 2 Add 4ml of NaClO solution with a mass concentration of 15% into 40ml of pH5.7 sodium phosphate buffer solution, stir and react at 36°C for 24 hours, add absolute ethanol to terminate the reaction, and pour the solution into the Erlenmeyer flask Stand in the middle and separate layers, pour off the supernatant, keep the lower layer, and replace the lower layer with ethanol and water with a volume concentration of 50% in turn to obtain a clean, thick gel-like carboxylated modified cellulose dispersion.

[0017] 2. Preparation of carboxylated-modified nano-cellulose dispersion: take 0.1 g of the dry-dried cellulose dispersion in Step 1, and process it with a high-pressure homogenizer to obtain a carboxylated-modified nano-cellul...

Embodiment 2

[0020] A preparation method of cellulose-based nano-silver composite material, according to the following steps:

[0021] 1. Preparation of carboxylated modified cellulose aqueous dispersion: weigh 1g microcrystalline cellulose, 0.14g TEMPO, 1.53g NaClO 2 Add 10ml of NaClO solution with a mass concentration of 15% into a sodium phosphate buffer solution with a volume of 270ml of pH6.8, stir and react at 45°C for 24 hours, add absolute ethanol to terminate the reaction, and pour the solution into a conical flask Stand in the middle and separate layers, pour off the supernatant, keep the lower layer, and replace the lower layer with ethanol and water with a volume concentration of 50% in turn to obtain a clean, thick gel-like carboxylated modified cellulose dispersion.

[0022] 2. Preparation of carboxylated modified nanocellulose dispersion: take 0.1 g of the dry cellulose dispersion in step 1, and process it with an ultrasonic cell pulverizer to obtain a carboxylated modified ...

Embodiment 3

[0025] A preparation method of cellulose-based nano-silver composite material, according to the following steps:

[0026] 1. Preparation of carboxylated modified cellulose aqueous dispersion: weigh 1g microcrystalline cellulose, 0.28g TEMPO, 2.53g NaClO 2 Add 16ml of NaClO solution with a mass concentration of 15% into 500ml of pH 8.0 sodium phosphate buffer solution, stir and react at 60°C for 24 hours, add absolute ethanol to terminate the reaction, and pour the solution into the Erlenmeyer flask Stand in the middle and separate layers, pour off the supernatant, keep the lower layer, and replace the lower layer with ethanol and water with a volume concentration of 50% in turn to obtain a clean, thick gel-like carboxylated modified cellulose dispersion.

[0027] 2. Preparation of carboxylated modified nanocellulose dispersion: take 0.1 g of the dry cellulose dispersion in step 1, and process it with an ultrasonic cell pulverizer to obtain a carboxylated modified nanocellulose...

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Abstract

The invention discloses a preparation method for a cellulose based nano silver composite material. The preparation method is adopted to obtain the cellulose based nano silver composite material through the following operation steps: preparing a carboxylic modified cellulose aqueous dispersion, preparing a carboxylic modified nano cellulose aqueous dispersion, and preparing the cellulose based nano silver composite material. The preparation method has the benefits that the carboxylic modified nano cellulose is adopted as a carrier, a stabilizer and a reductive agent of Ag<+>, the preparation method is rich in raw material sources and simple in preparation process, the product has the excellent properties of both cellulose and nano silver, and nano silver has the advantages of low probability of desorption, stable property and the like.

Description

technical field [0001] The invention relates to the field of preparation of composite materials, in particular to a preparation method of a cellulose-based nano silver composite material. Background technique [0002] Cellulose is the most abundant organic resource on the earth, and it has the characteristics of environmental friendliness such as renewable and easy biodegradability. The development and application of cellulose by human beings is very extensive and has a very long history. Nano-silver has excellent physical and chemical properties, and has a wide range of applications in the fields of chemistry, physics, electricity, optics, materials science and biology. However, with the development of science and technology, the properties of cellulose have shown certain limitations. Nano-silver can only be prepared in the presence of organic solvents and toxic reducing agents, which poses a certain potential threat to the environment. Contents of the invention [0003...

Claims

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Application Information

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IPC IPC(8): C08L1/28C08K3/08C08B11/12B22F9/24B82Y40/00
Inventor 桑显葵黄琳娟刘新亮张逸霞戴毅高聪田华丽
Owner GUANGXI UNIV
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