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Process for producing bacteria cellulose fibre with high degree of polymerization

A technology of bacterial cellulose, high degree of polymerization, applied in the direction of artificial filament in cellulose solution, fiber treatment, spinning solution preparation, etc., can solve problems such as difficulty in use, and achieve good adhesion, breaking strength and The effect of high modulus and simple preparation method

Inactive Publication Date: 2009-07-29
JIANGSU SHENGFENG DENGTAI BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although bacterial cellulose itself is a ribbon-shaped nanofiber, it is difficult to directly separate it into textile and industrial fibers; even if it can be separated, it is difficult to directly use it in some traditional textile processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A bacterial cellulose fiber with a high degree of polymerization, the fiber is composed of bacterial cellulose.

[0025] Preparation: (1) After pulverizing and drying bacterial cellulose with a degree of polymerization of 1500, adding 1.5mol / L lithium hydroxide / 0.65mol / L thiourea system, dissolving it at 0°C to make a concentration of 3.0% (mass percentage) Spinning solution, after stirring evenly, let it stand for 12 hours, filter, and defoam;

[0026] (2) The spinning solution enters the spinneret hole through the metering pump, enters the coagulation bath, the coagulation bath is water, and the temperature is 10°C, and then stretched by saturated water vapor, the stretching temperature is 100°C, and the stretching ratio is 1.5 double, then washed, oiled, and dried at a temperature of 120°C; the dried fibers were crimped at 90°C, heat-set at 130°C, and finally cut and packaged to obtain high-polymerization-degree bacterial cellulose staple fibers.

Embodiment 2

[0028] A bacterial cellulose fiber with a high degree of polymerization, the fiber is composed of bacterial cellulose.

[0029] Preparation: (1) Pulverize and dry bacterial cellulose with a degree of polymerization of 3000, add it to potassium permanganate / dimethylacetamide solution for activation for 1 hour, take it out and add lithium chloride / dimethylacetamide solution [the content of lithium chloride is 10 % (mass percentage)] in the solution, dissolved at 50°C to make a spinning solution with a concentration of 2.5% (mass percentage), stirred evenly and left to stand for 12h, filtered, and defoamed;

[0030] (2) The spinning solution is ejected through the metering pump into the spinneret hole, and enters the coagulation bath. The coagulation bath is a 20% ((mass percentage) dimethylacetamide aqueous solution at a temperature of 15° C., and then stretched by saturated water vapor. The temperature is 90°C, the stretch ratio is 1.8 times, then washed with water, oiled, and ...

Embodiment 3

[0032] A bacterial cellulose fiber with a high degree of polymerization is characterized in that the fiber is composed of bacterial cellulose.

[0033] Preparation: (1) Grind and dry bacterial cellulose with a degree of polymerization of 2500, add it to potassium permanganate / dimethyl sulfoxide solution for activation for 1 hour, take it out and add paraformaldehyde / dimethyl sulfoxide solution [the content of paraformaldehyde 10% (mass percentage)] solution, dissolved at 50°C to make a spinning solution with a concentration of 3.0% (mass percentage), stirred evenly and left to stand for 12 hours, filtered, and defoamed;

[0034] (2) The spinning solution enters the spinneret hole through the metering pump, enters the coagulation bath, the coagulation bath is 10% (mass percentage) dimethyl sulfoxide aqueous solution, the temperature is 10 ° C, and then stretched by saturated water vapor, stretched The temperature is 120°C, the draw ratio is 1.8 times, then washed with water, oi...

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PUM

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Abstract

The invention relates to a method for preparing a high polymerization degree bacterial cellulose fiber. The method comprises the following steps: (1) dissolving the bacterial cellulose in solvent to prepare bacterial cellulose solution with mass fraction of 1-30 percent, filtering and standing the solution for deaeration, thus obtaining spinning solution; (2) forming the spinning solution in the step (1) by solidifying after the solution is sprayed through a spinneret orifice, and preparing a finished product after several conventional processes, such as stretching, washing, shaping and drying. The preparation method is simple and is applicable to industrial production; compared with other cellulose fibers, the bacterial cellulose fiber has high rupture strength and module reaching the level of high-tensile industrial yarn, and has the advantages of good biocompatibility, odegradability, hydrophilicity and binding property with rubber.

Description

technical field [0001] The invention belongs to the field of preparation of cellulose fibers, in particular to a method for preparing bacterial cellulose fibers with a high degree of polymerization. Background technique [0002] Bacterial cellulose is a kind of cellulose prepared by fermentation method, which itself is a nanofiber ribbon with the characteristics of high crystallinity and high degree of polymerization. [0003] High-performance fibers were once limited to the application of national defense and aerospace, but now they have penetrated into the fields of cables, tire cords, sports and medical equipment, personal protective equipment and composite materials, forming an emerging high-tech industrial chain. In the high-tech industrial chain, bacterial cellulose fiber can be used directly as a product for high-strength tire cord; it can also be used as the precursor of carbon fiber to produce cellulose carbon fiber with better performance than viscose carbon fiber;...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01D5/00D01D5/06D01F2/02
Inventor 许春元沈新元
Owner JIANGSU SHENGFENG DENGTAI BIOTECH
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