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Method for preparing oxidized cellulose

A technology of oxidizing cellulose and oxidizing agents, which is applied in medical science, bandages, absorbent pads, etc., can solve the problems of difficult storage, high production cost, and difficulty in recycling, and achieve uniform reaction, stability, easy storage, and reduced production costs.

Active Publication Date: 2010-06-09
GUIZHOU JINJIU BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the preparation of oxidized cellulose is carried out by adding an oxidizing agent into an aqueous solution for reaction. Due to the high polarity of water, the oxidized cellulose produced is easy to shrink and break, and the product structure is unstable and difficult to store.
Directly use nitrogen oxides to oxidize cellulose under gaseous conditions, the reaction temperature is difficult to control, the reaction product is unstable, and must be stored at low temperature, and nitrogen oxides are expensive, difficult to recycle, and the production cost is extremely high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1. Add nitric acid and nitrite to the inert solution.

[0017] Take 50g of refined cotton, put it into a 5000ml flask, add 2000ml of HCFC-141b solution, add 500ml of 8% nitric acid, add 50g of sodium nitrite, seal it; stir it with a magnetic stirrer for 12 hours at a temperature of 20-30°C; 2000ml of purified water was washed three times, and after drying with a centrifuge, it was washed once with 2000ml of anhydrous isopropanol, taken out and dried at 90°C for 2 hours, and the carboxyl content was measured to be 8%.

Embodiment 2

[0018] Example 2. Add nitric acid and nitrite to the inert solution.

[0019] Take 50g of absorbent cotton gauze, put it into a 5000ml flask, add 2000ml of HCFC-141b solution, add 500ml of 8% nitric acid, add 50g of sodium nitrite, seal it; stir it with a magnetic stirrer for 12 hours, the temperature is 20-30°C, take out the Wash three times with 2000ml of purified water, dry it with a centrifuge, wash once with 2000ml of anhydrous isopropanol, take it out and dry it at 90°C for 2 hours, and the carboxyl content is 7%.

Embodiment 3

[0020] Example 3. Add nitric acid and nitrite to the inert solution.

[0021] Take 50g of regenerated fiber silk fabric, put it into a 5000ml flask, add 2000ml of cyanoflurane solution, add 500ml of 8% nitric acid, add 50g of sodium nitrite, and seal it; stir it with a magnetic stirrer for 12 hours at a temperature of 20-60°C Wash three times with 2000ml of purified water, dry it with a centrifuge, wash once with 2000ml of anhydrous isopropanol, take it out and dry it at 90°C for 2 hours, and the carboxyl content is 10%.

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PUM

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Abstract

The invention discloses a method for preparing oxidized cellulose. The preparation method comprises the following steps: a, putting an oxidized cellulose material into inert solution; b, adding an oxidant into the inert solution, sealing the solution, stirring the solution for 10 to 12 hours by using a magnetic stirrer at the temperature of between 20 and 60 DEG C; c, taking the oxidized cellulose material out, and washing the oxidized cellulose material with purified water; d, drying the oxidized cellulose material by using a centrifugal machine, and then washing the oxidized cellulose material by cleaning solution; and e, drying the oxidized cellulose material to obtain a finished product. Because the inert solution is used as a reaction solvent, the oxidization reaction can be performed under the controllable conditions, the reaction is even, and the manufactured oxidized cellulose and oxidized regenerated cellulose products are stable and easy to store; and the reaction solvent and the oxidant can be reclaimed for recycle, so the method is economic and environment-friendly, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of medical hemostatic material, especially oxidized cellulose. Background technique [0002] At present, oxidized cellulose is prepared by adding an oxidant to an aqueous solution for reaction. Due to the high polarity of water, the produced oxidized cellulose is easy to shrink and break, and the product structure is unstable and difficult to store. Directly using nitrogen oxides to oxidize cellulose under gaseous conditions, the reaction temperature is difficult to control, the reaction product is unstable, and must be stored at low temperature, and nitrogen oxides are expensive, difficult to recycle, and the production cost is extremely high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a new preparation method of oxidized cellulose. The method uses an inert liquid as a reaction solvent, so that the oxidation reaction can be carried out un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02A61L15/28
Inventor 李洪波
Owner GUIZHOU JINJIU BIOTECH
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