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Bacterial cellulose composite fiber and preparation method thereof

A technology of bacterial cellulose and bacterial cellulose film, which is applied in the field of bacterial cellulose composite fiber and its preparation, can solve the problems of poor mechanical properties of macroscopic fibers, expensive solvents, complicated processes, etc., achieve excellent mechanical properties, improve mechanical properties, The effect of low system cost

Active Publication Date: 2021-12-17
FANGDA CARBON NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned dissolution systems, NaOH / urea solution and phosphoric acid solvent will cause a large amount of depolymerization of bacterial cellulose and make the mechanical properties of macroscopic fibers poor. The solvents used in other systems are expensive, time-consuming, and complicated. The plain gel stretching and twisting process is cumbersome and difficult to produce on a large scale. The wet spinning process is complicated, time-consuming and costly, and the mechanical properties of the obtained fibers are poor.

Method used

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  • Bacterial cellulose composite fiber and preparation method thereof
  • Bacterial cellulose composite fiber and preparation method thereof
  • Bacterial cellulose composite fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Soak 10 g of bacterial cellulose membrane in 100 mL of NaOH solution for 8 hours. The concentration of NaOH is 10 g / L. After soaking, wash with deionized water until neutral;

[0031] Step 2: Cut the pretreated bacterial cellulose membrane into square pieces with a side length of about 5 cm, add the shredded bacterial cellulose membrane into a mechanical crushing equipment household soymilk machine, and continuously cut for 30 minutes to obtain Bacterial cellulose slurry, freeze-dried;

[0032] Step 3, adding the dried bacterial cellulose to a mixed solution of 50% sulfuric acid and 5wt.% calcium chloride (45g / L) by mass fraction, and passing through a special spinneret with graphene solution (10g / L) Extruded into an ethanol coagulation bath to obtain a composite primary fiber of bacterial cellulose.

[0033] Step 4: The as-spun fiber is stretched twice in a water bath at 60 degrees Celsius to obtain a high-performance bacterial cellulose composite fiber.

Embodiment 2

[0035] Step 1. Soak 10 g of bacterial cellulose membrane in 200 mL of NaOH solution for 8 hours. The concentration of NaOH is 5 g / L. After soaking, wash with deionized water until neutral;

[0036] Step 2: Cut the pretreated bacterial cellulose membrane into square pieces with a side length of about 5 cm, and process the shredded bacterial cellulose membrane with a homogenizer for 30 minutes to obtain bacterial cellulose slurry and freeze dry;

[0037] Step 3, adding the dried bacterial cellulose to a 20% hydrochloric acid solution and a 3wt.% calcium chloride mixed solution (50g / L) with a mass fraction of 20%, and spraying it with a polyvinyl alcohol solution (20g / L) The head was extruded into an ethanol coagulation bath to obtain a composite primary fiber of bacterial cellulose.

[0038] Step 4: The as-spun fiber is stretched 3 times in a water bath at 70 degrees Celsius to obtain a high-performance bacterial cellulose composite fiber.

Embodiment 3

[0040] Step 1, soak 20g bacterial cellulose membrane in 300mL NaOH solution for 10 hours, the concentration of NaOH is 40g / L, wash with deionized water to neutral after soaking;

[0041] Step 2: Cut the pretreated bacterial cellulose membrane into square pieces with a side length of about 5 cm, and process the shredded bacterial cellulose membrane with an ultrasonic cleaner for 50 minutes to obtain bacterial cellulose slurry, freeze dry;

[0042] Step 3, the dried bacterial cellulose is added to a mass fraction of 60% sulfuric acid solution and 7wt.% calcium chloride mixture (60g / L), and chitosan solution (10g / L) through a special spinneret Extruded into an ethanol coagulation bath to obtain a composite primary fiber of bacterial cellulose.

[0043] Step 4: The as-spun fiber is stretched 3 times in a water bath at 50 degrees Celsius to obtain a high-performance bacterial cellulose composite fiber.

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Abstract

The invention discloses bacterial cellulose composite fiber and a preparation method thereof. The preparation method comprises the following steps of carrying out alkali treatment on a grown bacterial cellulose membrane, washing thebacterial cellulose membrane to be neutral, cutting thebacterial cellulose membrane into small blocks, crushing thesmall blocks into slurry by a machine, drying the slurry, dissolving the slurry in a calcium chloride / acid dissolution system, extruding a bacterial cellulose solution and a second-phase solution into a coagulating bath through a special composite spinning nozzle, making the two solutions form spiral heterogeneous nascent fibers under the action of rifles in the spinning nozzle, and performing drying and water bath stretching on the fibers to prepare the bacterial cellulose composite fiber. The process is simple, the cost is low, large-scale production is easy, and the prepared bacterial cellulose composite fiber is excellent in mechanical property.

Description

technical field [0001] The invention relates to the technical field of bio-based fibers, and in particular to a bacterial cellulose composite fiber and a preparation method thereof. Background technique [0002] With the rapid development of economy and society, the rapid development of science and technology, the depletion of non-renewable resources such as petroleum, the effective utilization of renewable resources is imminent. Cellulose is an inexhaustible renewable resource on the earth and has great application potential in replacing petroleum products. Bacterial cellulose (BC) is a kind of cellulose grown on the air-liquid interface by culturing bacteria. Its shape is (without hemicellulose and lignin) in the form of fibril ribbons with high crystallinity (70-89%). The high crystalline structure of BC endows it with excellent mechanical properties (Young's modulus is as high as 114GPa). At the same time, BC has achieved industrialized large-scale production, low cost,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/02D01F8/18D01F8/10D01D5/06D01D5/14D01D5/30D01D1/02
CPCD01F8/02D01F8/18D01F8/10D01D5/06D01D5/14D01D5/30D01D1/02
Inventor 拜永孝胡新军党锡江张桂兰
Owner FANGDA CARBON NEW MATERIAL CO LTD
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