A kind of preparation method of continuous cellulose-nanometal composite aerogel fiber

Abstract

The invention provides a method for manufacturing continuous cellulose-nano-metal composite airgel fibers, which includes the following steps: preparing a cellulose dispersion as a spinning stock solution, and then adding a nano-metal catalyst; adding acidic solution and ethanol solution to the coagulation tank. Or an acetone solution is used as a coagulation bath; the spinning stock solution after adding the nanocatalyst is added to the coagulation bath, and wet spinning is performed to obtain cellulose gel fibers containing nanometal catalysts; cellulose gel fibers containing nanometal catalysts are Coil, immerse in the aging solution and age at room temperature for 15 minutes to 1 hour, wash with deionized water until neutral, then use deionized water, ethanol or tert-butanol for solvent replacement, and dry to obtain continuous cellulose-with catalytic properties. Nano-metal composite airgel fiber. The manufacturing method of continuous cellulose-nano metal composite airgel fiber provided by the invention has the characteristics of wide source of raw materials, low cost, simple preparation process, green and pollution-free, and good spinnability.

Description

technical field

[0001] The invention belongs to the field of airgel preparation, and in particular relates to a preparation method of continuous cellulose-nano metal composite airgel fiber. The continuous cellulose-nano metal composite airgel fiber has catalytic function. Background technique

[0002] A catalyst is a class of substances that alter the rate of a chemical reaction without itself entering into the molecular makeup of the final product. In practical applications, catalytically active components such as gold, silver, platinum, palladium, etc. are often expensive and have low utilization rates. In order to improve the catalytic efficiency of catalysts and reduce the amount of catalytically active components, the catalytically active components are loaded on the carrier. The carrier can make the catalyst have a certain shape, size and mechanical strength, and can disperse the active components on the surface of the carrier to obtain a higher specific surface area a...

Examples

Embodiment 1

[0029] Example 1 A preparation method of continuous cellulose / nano-Ag composite airgel fibers 1

[0030]Preparation process: disperse bacterial cellulose in a low-temperature solvent system with a mass fraction of 7% NaOH / 8% urea / 10% thiourea as a spinning stock solution, wherein the mass fraction of bacterial cellulose is 2%, and add The mass fraction is 0.8% nano-Ag catalyst, mechanical strong stirring 30min, carries out defoaming treatment 20min with centrifuge 10000r / min, in coagulation tank, add the ethanol aqueous solution that volume fraction is 10% as coagulation bath, add in this coagulation bath The spinning dope after the defoaming treatment was subjected to wet spinning, and the extrusion speed of the spinning dope was 0.6 m / min. The nano-Ag-containing cellulose gel fibers formed in the coagulation bath were wound at a winding speed of 0.6 m / min. The wound fibers were immersed in pure ethanol solution and aged for 1 h to make them completely gelled. After aging, ...

Embodiment 2

[0035] Example 2 A preparation method of continuous cellulose / nano-Au composite airgel fibers 2

[0036] making process:

[0037] Disperse the treated cotton pulp cellulose (the cellulose cotton pulp is mechanically crushed, washed with water and ethanol several times and then dried in a vacuum oven at 50°C) in a mass fraction of 8% NaOH / 8% urea / 6.5% thiourea In the low-temperature solvent system, it is used as the spinning stock solution, wherein the mass fraction of cotton pulp cellulose is 7%, and the nano-Au catalyst with a mass fraction of 0.5% is added to the spinning stock solution, and the mechanical strength is stirred for 30 minutes. After soaking for 20 minutes, pour the ethanol aqueous solution with a volume fraction of 50% into the coagulation tank as a coagulation bath, add the spinning stock solution after the defoaming treatment in the coagulation bath, and carry out wet spinning. The extrusion speed of the spinning stock solution It is 3m / min. The cellulose ...

Embodiment 3

[0041] Embodiment 3 A kind of preparation method of continuous cellulose / nano-Pd composite airgel fiber 3

[0042] making process:

[0043] The bacterial cellulose is dispersed in a low-temperature solvent system with a mass fraction of 9.5% NaOH / 4.5% thiourea as a spinning stock solution, wherein the mass fraction of bacterial cellulose is 3%, and a nano-Pd catalyst with a mass fraction of 0.1% is added. Stir vigorously for 30 minutes, carry out defoaming treatment with a centrifuge at 10000r / min for 20 minutes, pour acetone aqueous solution with a volume fraction of 10% into a coagulation tank as a coagulation bath, pour the spinning stock solution after degassing into the coagulation bath, and carry out For wet spinning, the extrusion speed of the spinning dope is 1.8m / min. The nano-Pd-containing cellulose gel fibers formed in the coagulation bath were wound at a winding speed of 2 m / min. The wound fiber was immersed in pure acetone solution for 20min to make it completel...

technical field

[0001] The invention belongs to the field of airgel preparation, and in particular relates to a preparation method of continuous cellulose-nano metal composite airgel fiber. The continuous cellulose-nano metal composite airgel fiber has catalytic function. Background technique

[0002] A catalyst is a class of substances that alter the rate of a chemical reaction without itself entering into the molecular makeup of the final product. In practical applications, catalytically active components such as gold, silver, platinum, palladium, etc. are often expensive and have low utilization rates. In order to improve the catalytic efficiency of catalysts and reduce the amount of catalytically active components, the catalytically active components are loaded on the carrier. The carrier can make the catalyst have a certain shape, size and mechanical strength, and can disperse the active components on the surface of the carrier to obtain a higher specific surface area a...

Examples

Embodiment 1

[0029] Example 1 A preparation method of continuous cellulose / nano-Ag composite airgel fibers 1

[0030]Preparation process: disperse bacterial cellulose in a low-temperature solvent system with a mass fraction of 7% NaOH / 8% urea / 10% thiourea as a spinning stock solution, wherein the mass fraction of bacterial cellulose is 2%, and add The mass fraction is 0.8% nano-Ag catalyst, mechanical strong stirring 30min, carries out defoaming treatment 20min with centrifuge 10000r / min, in coagulation tank, add the ethanol aqueous solution that volume fraction is 10% as coagulation bath, add in this coagulation bath The spinning dope after the defoaming treatment was subjected to wet spinning, and the extrusion speed of the spinning dope was 0.6 m / min. The nano-Ag-containing cellulose gel fibers formed in the coagulation bath were wound at a winding speed of 0.6 m / min. The wound fibers were immersed in pure ethanol solution and aged for 1 h to make them completely gelled. After aging, ...

Embodiment 2

[0035] Example 2 A preparation method of continuous cellulose / nano-Au composite airgel fibers 2

[0036] making process:

[0037] Disperse the treated cotton pulp cellulose (the cellulose cotton pulp is mechanically crushed, washed with water and ethanol several times and then dried in a vacuum oven at 50°C) in a mass fraction of 8% NaOH / 8% urea / 6.5% thiourea In the low-temperature solvent system, it is used as the spinning stock solution, wherein the mass fraction of cotton pulp cellulose is 7%, and the nano-Au catalyst with a mass fraction of 0.5% is added to the spinning stock solution, and the mechanical strength is stirred for 30 minutes. After soaking for 20 minutes, pour the ethanol aqueous solution with a volume fraction of 50% into the coagulation tank as a coagulation bath, add the spinning stock solution after the defoaming treatment in the coagulation bath, and carry out wet spinning. The extrusion speed of the spinning stock solution It is 3m / min. The cellulose ...

Embodiment 3

[0041] Embodiment 3 A kind of preparation method of continuous cellulose / nano-Pd composite airgel fiber 3

[0042] making process:

[0043] The bacterial cellulose is dispersed in a low-temperature solvent system with a mass fraction of 9.5% NaOH / 4.5% thiourea as a spinning stock solution, wherein the mass fraction of bacterial cellulose is 3%, and a nano-Pd catalyst with a mass fraction of 0.1% is added. Stir vigorously for 30 minutes, carry out defoaming treatment with a centrifuge at 10000r / min for 20 minutes, pour acetone aqueous solution with a volume fraction of 10% into a coagulation tank as a coagulation bath, pour the spinning stock solution after degassing into the coagulation bath, and carry out For wet spinning, the extrusion speed of the spinning dope is 1.8m / min. The nano-Pd-containing cellulose gel fibers formed in the coagulation bath were wound at a winding speed of 2 m / min. The wound fiber was immersed in pure acetone solution for 20min to make it completel...

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