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Preparation process of oxidized regenerated cellulose material

A technology of regenerated cellulose and preparation technology, which is applied in the field of preparation technology of oxidized regenerated cellulose materials, which can solve the problems of affecting production progress, difficulty in waste gas recovery, and long oxidation time, so as to improve production efficiency, reduce the degree of polymerization, and improve the recovery rate. high effect

Active Publication Date: 2022-04-15
赵建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the early preparation methods, these methods have their own advantages, but their common disadvantages are that it is difficult to recover exhaust gas, and NO 2 Expensive, high cost
[0008] Patent No. "CN201210088503.X" is titled "A Preparation Method for Oxidizing Nanoscale Bacterial Cellulose", which uses gaseous oxidation and solution oxidation to selectively oxidize cellulose, but this method takes a long time to oxidize and has low efficiency. In actual production, it will greatly affect the production progress

Method used

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  • Preparation process of oxidized regenerated cellulose material
  • Preparation process of oxidized regenerated cellulose material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 A preparation process of oxidized regenerated cellulose material, comprising the following steps:

[0047] S1, activation

[0048] The cellulose raw material is activated, and the activator uses cellulase to destroy the crystal structure of the cellulose chain, including crushing the cellulose to 90 mesh and placing it in distilled water, adjusting the pH value to 5, adding cellulase, Enzymolysis reaction under the conditions for 100 minutes, drying at 75°C for 2.5 hours to obtain activated cellulose.

[0049] The mass ratio of the cellulose to distilled water is 1:1.7.

[0050] The added amount of the cellulase is 6 FPIU per gram of cellulose.

[0051] S2, exhaust

[0052] Place the activated cellulose evenly on the mesh shelf of the reaction chamber, close the intake valve and exhaust valve, open the exhaust hole and use vacuum pumping to extract the air in the reaction chamber.

[0053] The vacuum degree of the vacuum pumping is 0.15Mpa.

[0054] S3...

Embodiment 2

[0067] Embodiment 2 A preparation process of oxidized regenerated cellulose material, comprising the following steps:

[0068] S1, activation

[0069] The cellulose raw material is activated, and the activator uses cellulase to destroy the crystal structure of the cellulose chain, including crushing the cellulose to 80 mesh and placing it in distilled water, adjusting the pH value to 4.8, adding cellulase, Enzymolysis reaction under the condition of 110 minutes, drying at 70° C. for 3 hours to obtain activated cellulose.

[0070] The mass ratio of the cellulose to distilled water is 1:1.5.

[0071] The added amount of the cellulase is 5 FPIU per gram of cellulose.

[0072] S2, exhaust

[0073] Place the activated cellulose evenly on the mesh shelf of the reaction chamber, close the intake valve and exhaust valve, open the exhaust hole and use vacuum pumping to extract the air in the reaction chamber.

[0074] The vacuum degree of the vacuum pumping is 0.1Mpa.

[0075] S3,...

Embodiment 3

[0088] Embodiment 3 A preparation process of oxidized regenerated cellulose material, comprising the following steps:

[0089] S1, activation

[0090] Activate the cellulose raw material, the activator uses cellulase to destroy the crystal structure of the cellulose chain, including crushing the cellulose to 100 mesh and placing it in distilled water, adjusting the pH value to 5.5, adding cellulase, at 55 °C Enzymolysis reaction under conditions for 90 minutes, drying at 80° C. for 2 hours to obtain activated cellulose.

[0091] The mass ratio of the cellulose to distilled water is 1:2.

[0092] The added amount of the cellulase is 7 FPIU per gram of cellulose.

[0093] S2, exhaust

[0094] Place the activated cellulose evenly on the mesh shelf of the reaction chamber, close the intake valve and exhaust valve, open the exhaust hole and use vacuum pumping to extract the air in the reaction chamber.

[0095] The vacuum degree of the vacuum pumping is 0.2Mpa.

[0096] S3, ox...

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Abstract

The invention provides a preparation process of an oxidized regenerated cellulose material. The preparation process comprises the following steps: activating, exhausting, oxidizing, collecting liquid, eluting, post-treating and recycling nitrogen dioxide. Nitrogen dioxide gas in the gas cylinder is introduced into the reaction chamber of the continuous gas recoverable high-pressure reaction kettle, and the nitrogen dioxide gas is converted into liquid by adjusting the pressure, so that cellulose is oxidized in the nitrogen dioxide liquid, and the oxidation degree is high. By adopting the process provided by the invention, the oxidation time and temperature can be accurately controlled, the consistency of the oxidation degree of the regenerated cellulose is achieved, and the carboxyl content in the oxidized regenerated cellulose is 23.9-24.1 umol / g. The oxidation reaction is carried out in a closed and controllable high-pressure reaction kettle, the reaction rate is high, the very high oxidation degree can be achieved within a short time, the oxidizing agent nitrogen dioxide can be completely recovered, and the recovery rate is high. The prepared oxidized regenerated cellulose material is reduced in polymerization degree, good in water solubility, capable of forming gel when encountering water, capable of rapidly expanding in volume and capable of further pressing broken ends of blood vessels to stop bleeding when used.

Description

technical field [0001] The invention belongs to the technical field of regenerated cellulose, and in particular relates to a preparation process of oxidized regenerated cellulose material. Background technique [0002] The research on the aggregate structure of cellulose shows that cellulose is composed of crystalline phase and amorphous phase. A large number of hydroxyl groups in crystalline cellulose form numerous hydrogen bonds, including intermolecular hydrogen bonds, and then form a huge hydrogen bond network, which directly leads to the formation of a dense crystalline structure. The degree of polymerization of cellulose is about 3500-10000, and the dense structure with high crystallinity hinders the effective contact between cellulose and chemical reagents, which limits the application of cellulose materials. [0003] The oxidized regenerated cellulose material is mainly based on regenerated cellulose as raw material, through the selective oxidation of the primary hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/04C12P19/14C12P19/04A61L24/08A61L24/00
CPCY02P20/54
Inventor 赵建
Owner 赵建