Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF0 Cites 9 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
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%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more