Lignin base skin core structure nanometer/micron fiber and preparation method thereof

A skin-core structure and lignin-based technology, applied in the field of materials, can solve the problems of low electrical conductivity, limited viscoelasticity of lignin solution, and inability to form lignin-based skin-core fibers, etc., and achieve the effect of simple preparation method and mild conditions

CN102517689AActive Publication Date: 2012-06-27SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2012-06-27

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Abstract

The invention discloses a preparation method of a lignin base skin core structure nanometer / micron fiber. The preparation method comprises the following steps: (1) by mass, adding one part of mixture of lignin and petroleum base macromolecules into 1-20 parts of organic solvents, and obtaining a lignin mixing solution after evenly mixing and fully dissolving the mixture; adding 1 part of natural or synthetic macromolecules into 4-25 parts of solvents, and obtaining a macromolecule solution after evenly mixing and fully dissolving the natural or synthetic macromolecules; and (2)performing coaxial electric spinning, leading the lignin mixing solution and the macromolecule solution respectively into two layers of a coaxial needle head, and obtaining the lignin base skin core structure nanometer / micron fiber under the effects of 5-100kV high-voltage electrostatic field when the solutions are stably extruded out of the coaxial needle head. The preparation method is simple and moderate in conditions, reduces degree of diffusion of the lignin towards a skin layer simultaneously, and improves continuity and evenness of a core layer material in the fiber.
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Description

technical field

[0001] The invention belongs to the field of materials, and particularly relates to a lignin-based skin-core structure nano / micron fiber and a preparation method thereof. Background technique

[0002] Skin-core structure nano / micro fiber is a kind of nano / micro material, because its core layer and skin layer are composed of different materials, compared with traditional nano / micro fiber, it not only has the characteristics of small size, large specific surface area and excellent physical properties, etc. At the same time, the advantages of compounding two or more different constituent substances with a skin-core structure expand the application field and improve the material properties. The field has very broad application prospects. Skin-core structure nano / micro fibers can be prepared by uniaxial electrospinning and coaxial electrospinning. Among them, uniaxial electrospinning is a process in which the electrospinning solution is ejected through a uniaxia...

Examples

Embodiment 1

[0029] 1. Preparation of the core layer solution: put the mixture of 2.5g lignin and 2.5g polyacrylonitrile into 100g N,N-dimethylacetamide, stir to dissolve it completely, and become the lignin mixed solution;

[0030] 2. Preparation of cortex solution: put 5g of polylactic acid into 50g of N,N-dimethylformamide, stir to dissolve it completely, and become a polymer solution;

[0031] 3. Coaxial electrospinning: use such as figure 1In the shown coaxial electrospinning device, the positive and negative electrodes are respectively connected to the coaxial needle 4 and the collecting plate 7 , and the coaxial needle 4 and the collecting plate 7 are located in the constant temperature and humidity container 5 . The distance between the coaxial needle 4 of the electrospinning device and the grounded collecting plate 7 is 5cm, the inner diameter of the inner layer of the coaxial needle 4 is 0.1mm, and the inner diameter of the outer layer is 0.5mm (that is, the inner diameter of the...

Embodiment 2

[0033] 1. Preparation of the core layer solution: put 3.25g of lignin and 1.75g ​​of polyurethane mixture into 50g of N,N-dimethylformamide, stir to dissolve it completely, and become a lignin mixed solution;

[0034] 2. Preparation of cortex solution: 5g of cellulose is put into 25g of lithium chloride / dimethylacetamide with a mass ratio of 7:93, and stirred to dissolve it completely to become a polymer solution;

[0035] 3. Coaxial electrospinning: use such as figure 1 In the shown coaxial electrospinning device, the positive and negative electrodes are respectively connected to the coaxial needle 4 and the collecting plate 7 , and the coaxial needle 4 and the collecting plate 7 are located in the constant temperature and humidity container 5 . The distance between the coaxial needle 4 of the electrospinning device and the grounded collection plate 7 is 25cm, the inner diameter of the coaxial needle 4 is 1mm, and the inner diameter of the outer layer is 2.5mm (that is, the i...

Embodiment 3

[0037] 1. Preparation of core layer solution: put the mixture of 4.5g lignin and 0.5g polyethylene oxide into 5g acetone, stir to dissolve it completely, and become a polymer solution and become a lignin mixed solution;

[0038] 2. Preparation of cortex solution: put 5g of cellulose acetate into 50g of acetic acid, stir to dissolve it completely, and become a polymer solution;

[0039] 3. Coaxial electrospinning: use such as figure 1 In the shown coaxial electrospinning device, the positive and negative electrodes are respectively connected to the coaxial needle 4 and the collecting plate 7 , and the coaxial needle 4 and the collecting plate 7 are located in the constant temperature and humidity container 5 . The distance between the coaxial needle 4 of the electrospinning device and the grounded collection plate 7 is 40 cm, the inner diameter of the coaxial needle 4 is 0.5 mm, and the inner diameter of the outer layer is 1.5 mm (that is, the inner diameter of the outer layer ...