Oxidized cellulose nanofibers and preparation method thereof

A technology for oxidizing cellulose and nanofibers, which is applied to artificial filaments made of cellulose derivatives, fiber processing, filament/thread forming, etc. It can solve the problems of difficult electrospinning of cellulose solutions and achieve electrical conductivity. Enhancement, safe operation, mild degradation effect

Inactive Publication Date: 2011-08-10
ZHANGJIAGANG NELLNANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cellulose solutions are more difficult to electrospin, main

Method used

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  • Oxidized cellulose nanofibers and preparation method thereof
  • Oxidized cellulose nanofibers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Immerse 5 g of dried microcrystalline cellulose fibers in 500 ml of sodium periodate aqueous solution with a molar concentration of 0.1 mol / L. The bath ratio is 1:100. Fully wash until the pH value of the water is about 7.0, freeze-dry after dehydration.

[0021] 2. A certain amount of dry oxidized cellulose was weighed, and LiCl / DMAc was selected as the dissolution system, wherein the mass ratio of the three substances was LiCl / DMAc / oxidized cellulose (7.2 / 82.8 / 10). The prepared oxidized cellulose solution was subjected to electrospinning under high pressure conditions. The electrospinning conditions were: room temperature, voltage 28kv, flow rate of spinning solution 0.5ml / h, receiving distance 15cm.

[0022] See attached figure 1 , which is the infrared spectrogram of the oxidized cellulose nanofibers provided in this example. The curve in the figure shows that the oxidized cellulose nanofibers at 1750cm -1 There is an obvious aldehyde absorption peak at , and ...

Embodiment 2

[0024] 1. Immerse 5 g of dried microcrystalline cellulose fibers in 500 ml of sodium periodate aqueous solution with a molar concentration of 0.1 mol / L. The bath ratio is 1:100. Fully wash until the pH value of the water is about 7.0, freeze-dry after dehydration.

[0025] 2. Weigh a certain amount of dry oxidized cellulose, choose NMMO / H 2 O as a dissolved system, the mass ratio of the three substances NMMO / H 2 O / oxidized cellulose is 18 / 72 / 10, and the dissolution temperature is 80°C. The prepared oxidized cellulose solution was electrospun under high pressure conditions. The electrospinning conditions were: room temperature, voltage 30kv, spinning solution temperature 80°C, temperature spinning solution flow rate 0.5ml / h, receiving distance 15cm, receiving The device temperature is 80°C, and the spinning time is 5h. The average diameter of the fibers of the obtained non-woven fabric is 230 nm, and the thickness of the non-woven fabric is between 0.1 and 0.15 mm.

Embodiment 3

[0027] 1. Immerse 5 g of dried cotton linters in 500 ml of sodium periodate aqueous solution with a molar concentration of 0.1 mol / L, the bath ratio is 1:100, oxidize in the dark at 50°C for 48 hours, and use deionized water Fully wash until the pH value of the water is about 7.0, freeze-dry after dehydration.

[0028] 2. Weigh a certain amount of dry oxidized cellulose, and select LiCl / DMAc as the dissolution system, wherein the mass ratio of the three substances LiCl / DMAc / oxidized cellulose is 8 / 84 / 8. The prepared oxidized cellulose solution was electrospun under high pressure conditions. Electrospinning conditions are: room temperature, voltage 28kv, spinning solution flow rate 0.5ml / h, receiving distance 15cm, spinning time 5h. The average diameter of the obtained non-woven fabric fiber is about 220nm, and the thickness of the non-woven fabric is between 0.1-0.15mm.

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Abstract

The invention relates to a preparation method for aldehyde group or carboxyl group-containing oxidized cellulose nanofibers by adopting an electrostatic spinning method. The preparation method comprises the following steps of: oxidizing cellulose and performing electrostatic spinning on oxidized cellulose solution, wherein aldehyde groups and carboxyl groups are generated in the oxidized cellulose; 0.1 to 30 percent oxidized cellulose solution is obtained by dissolving the oxidized cellulose in a dissolution system; and oxidized cellulose non-woven fabric with the average thickness of 0.01 mu m to 5 mm, the porosity of 60 to 90 percent, the tensile strength of 1 to 20 MPa and the elastic elongation percentage of 1 to 15 percent; and the fibers have the diameters of between 50 nm and 3 mu m.

Description

technical field [0001] The invention relates to a cellulose material and its preparation, in particular to a technique for obtaining cellulose nanofibers by an electrospinning method, which belongs to the technical field of nanomaterial preparation. Background technique [0002] As the largest amount of renewable biomass on earth, cellulose has many excellent characteristics such as simple extraction, low price, and environmental protection, and is widely used in various fields of life. For example, cotton fiber can be directly used for spinning, weaving, wood, etc. After simple processing, cellulose and straw can be directly used in the manufacture of paper and various packaging materials, and the application of many derivatives of cellulose has penetrated into all aspects of people's basic necessities of life. With the improvement of living standards, the advancement of science and technology, the energy crisis and the need for sustainable development, people's development...

Claims

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Application Information

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IPC IPC(8): D01F2/24D01D5/00C08B15/02C08B15/04
Inventor 姚理荣张峰
Owner ZHANGJIAGANG NELLNANO TECH
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