Macroscopic fibers based on directional arrangement of bacterial cellulose nanofibers and preparation method of macroscopic fibers

A bacterial cellulose and nanofiber technology, applied in fiber treatment, spinning solution preparation, wet spinning, etc., can solve the problems of not fully expressing the excellent properties of nanocellulose, achieve high crystallinity, improve plasticizing swelling, Effect of improving Young's modulus and tensile strength

Inactive Publication Date: 2016-09-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bacterial cellulose nanofibers have a high aspect ratio (>100) and high crystallinity (>80%), which makes the nanofibers have excellent mechanical properties, with a Young's modulus of 114 GPa, but reported disordered bacterial cellulose The Young's modulus of the film can only reach about 10GPa, which is far lower than the theoretical value, and does not fully express the excellent performance of nanocellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]A method for preparing macroscopic fibers based on the directional arrangement of bacterial cellulose nanofibers. First, a homogenizer is used to pulverize and beat the bacterial cellulose wet film at a rate of 4000rpm / min, and then soaked in chloroacetic acid / chloroacetic acid with a molar ratio of 1:40 In isopropanol for 20 minutes, take it out, add NaOH / methanol with a molar ratio of 1:20, heat to boiling, keep boiling for 30 minutes, and then centrifuge and concentrate to form a suspension. The solid content of the suspension is 1wt%. The polymerization of bacterial cellulose The degree is 250, the diameter of bacterial cellulose nanofiber is 15nm, and the length is 5.1μm; -1 The shear rate and the extrusion speed of 20m / min are extruded, and then solidified after staying in acetone at 5°C for 20s, and the solidified fibers are rested in water at 10°C for 20s, and then post-stretched at a stretch ratio of 1.1 , to obtain initial macroscopic fibers; immerse the initia...

Embodiment 2

[0042] A method for preparing macroscopic fibers based on the directional arrangement of bacterial cellulose nanofibers. First, the bacterial cellulose wet film is pulverized and pulped at a rate of 7000rpm / min by a roller mill, and then soaked in chloroacetic acid / chloroacetic acid with a molar ratio of 1:60 In isopropanol for 40 minutes, after taking it out, add NaOH / methanol with a molar ratio of 1:30 and heat to boiling, keep boiling for 60 minutes, then centrifuge and concentrate to form a suspension, the solid content of the suspension is 3.5wt%, and the bacterial cellulose The degree of polymerization is 425, the diameter of bacterial cellulose nanofibers is 28nm, and the length is 5.5μm; the spinning suspension is filtered and metered, and then 2500s -1 The shear rate and the extrusion speed of 60m / min were extruded, and then solidified after staying in ethanol at 15°C for 30s. The solidified fibers stayed in acetone at 18°C ​​for 30s, and then stretched at a stretch ra...

Embodiment 3

[0045] A method for preparing macroscopic fibers based on the directional arrangement of bacterial cellulose nanofibers. First, a microfluidic jet high-pressure homogenizer is used to crush and beat the bacterial cellulose wet film at a rate of 10,000 rpm / min, and then soaked in a chloroacetic acid / isopropanol for 60min, after taking it out, add it to NaOH / methanol with a molar ratio of 1:40 and heat to boiling, keep boiling for 90min, then centrifuge and concentrate to form a suspension, the solid content of the suspension is 6wt%, and the bacteria The degree of polymerization of cellulose is 600, the diameter of bacterial cellulose nanofibers is 40nm, and the length is 6.0μm; the spinning suspension is filtered and metered, and then 4000s -1 Extrude at a shear rate of 100m / min at an extrusion speed of 100m / min, solidify and form after staying in ether at 25°C for 40s, and stay in ethanol at 25°C for 40s after solidification, and then post-draw at a stretch ratio of 1.4 Stret...

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Abstract

The invention relates to macroscopic fibers based on directional arrangement of bacterial cellulose nanofibers and a preparation method of the macroscopic fibers. Carboxymethyl-modified bacterial cellulose nanofibers are processed with a wet spinning forming and crosslinking technology, and continuous preparation of the macroscopic-assembling fibers based on the bacterial cellulose nanofibers is realized. On the basis of influence of the force field environment on nanofiber orientation and regulation of technological parameters, regulation of design and performance of a macroscopic fiber structure is realized, and the macroscopic fibers with high mechanical properties are prepared; further, by means of cross-linking of oxygen-containing groups of the nanofibers, the acting force among the nanofibers is increased, Young modulus and tensile strength are improved, the defect of plasticizing swelling of the macroscopic fibers under a high-humidity condition is remarkably overcome, so that the excellent mechanical properties and flexibility of the bacterial cellulose nanofibers are more effectively represented in the aspect of macroscopic size from the perspective of nanoscale, and the bacterial cellulose nanofiber based macroscopic fibers with high crystallinity (in a cellulose crystal form I) and high performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of preparing macroscopic fibers from nanofibers, and relates to macroscopic fibers based on directional arrangement of bacterial cellulose nanofibers and a preparation method thereof. Background technique [0002] The research and development of bio-based fibers is of great significance to the sustainable development of the industry and even the country. With the growth of the global population, the human demand for energy continues to increase, and the reduction of non-renewable resources is a problem that human beings have to face in the future development. Therefore, the pursuit of renewable energy and raw materials is a global development trend, and the biomanufacturing industry will be a strategic field that will affect the future. "The Twelfth Five-Year Plan for the Development of National Strategic Emerging Industries" lists the bio-industry as one of the seven strategic emerging industries; the "Twe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/02D01D5/06D06M11/155D06M11/56D06M13/192
CPCD01D1/02D01D5/06D06M11/155D06M11/56D06M13/192
Inventor 王华平姚晶晶陈仕艳王宝秀关方怡陈燕江振林
Owner DONGHUA UNIV
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