A hyaluronic acid medical dressing
A hyaluronic acid and medical technology, applied in medical science, absorbent pads, bandages, etc., can solve the problems of short use time, serious waste, and long use cycle
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Examples
Embodiment A
[0023] Preparation of permanent hydrophobic airgel
[0024] With 1 liter of sodium water glass solution (containing 7% by weight of SiO2 and Na2O: SiO2 is 1: 3.3) and 0.5 liters of acidic ion exchange resin (the copolymer of styrene-divinylbenzene with sulfonic acid groups, commercially available under the tradename Duolite C20) were stirred together until the pH of the aqueous solution was 2.3. Then, the ion exchange resin was filtered off and the aqueous solution was adjusted to pH 5.0 using 1 molar NaOH solution. Then, the resulting gel was aged at 85° C. for 3 hours and the water was subsequently replaced with acetone, using 3 liters of acetone. The acetone-containing gel was then silylated with trimethylchlorosilane (5% by weight trimethylchlorosilane / gram wet gel). The gel was dried in air (3 hours at 40°C, then 2 hours at 50°C and 12 hours at 150°C).
[0025] The resulting transparent airgel had a density of 0.15 g / cm3, a specific surface area according to BET of 480...
Embodiment B
[0027] Preparation of Hydrophilic Airgel
[0028] The permanent hydrophobic airgel prepared in Example 1 was pyrolyzed in a tube furnace at 600 °C for 1 hour in a gentle air flow. The obtained transparent airgel had a density of 0.18 g / cm3, a specific surface area according to BET of 450 m2 / g, and it was hydrophilic.
[0029] Example of use:
[0030] In the usage examples, the hydrophilic and hydrophobic aerogels obtained according to the preparation methods of Examples A and B were used.
Embodiment 1
[0032] The composition is as follows:
[0033] Application (face) film material: non-woven fabric or silk or pectin fiber cloth;
[0034] Hyaluronic acid solution (original) solution: an aqueous solution of sodium hyaluronate, which also contains sodium alginate, glycerin, and preservatives. The contents in their solutions are: sodium hyaluronate 1mg / ml~2mg / ml, sodium alginate 5mg / ml~20mg / ml, glycerin 10mg / ml~300mg / ml, (optional) preservative 0mg / ml~5mg / ml ml, the balance is water (the total amount of supplement (solution) is / 1ml), the pH value is 6-7;
[0035] Aerogels prepared based on inorganic materials: hydrophilic aerogels and hydrophobic aerogels obtained by the preparation methods of Examples A and B, the ratio of hydrophilic aerogels and hydrophobic aerogels is 1:2-3 ;
[0036] The weight ratio of the above-mentioned airgel and the above-mentioned hyaluronic acid stock solution is 1:3-5.
[0037] The above-mentioned hyaluronic acid solution (original) solution is ...
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Abstract
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