Method for preparing medical auxiliary material capable of swelling after absorbing liquid
An aqueous solution and chitosan fiber technology, which can be used in absorbent pads, medical science, bandages, etc., can solve the problems of strong toxicity of chloroacetic acid, high production costs, and easy residues, etc., and achieve good bactericidal effect, reduce scars, and strong Antibacterial effect
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[0019] The preparation method of the liquid-absorbing swelling medical dressing provided by the invention comprises the following steps:
[0020] 1. Succinic anhydride (C 4 h 4 o 3 , Xincheng Chemical Company, Foshan, Guangdong, China) soluble in ethanol or acetone aqueous solution with a volume ratio concentration greater than 70%, the amount of succinic anhydride used depends on the processing capacity of chitosan fiber non-woven fabrics The mass ratio of chitosan fiber nonwoven fabric (Qingdao Jifa New Material Co., Ltd., China) is 0.3-0.79:1. The volume of the aqueous solution of ethanol or acetone is controlled so that the chitosan fiber non-woven fabric can be fully submerged as the criterion.
[0021] At room temperature, stir well until the succinic anhydride is completely dissolved.
[0022] 2. Add the hydrochloric acid solution to the mixture prepared in step 1, and stir until the mixture is uniform. The mass ratio of the pure hydrochloric acid to the chitosan f...
Embodiment 1
[0026] 1. Dissolve 10 g of succinic anhydride in 1000 ml of 85% ethanol solution, and stir until the succinic anhydride is completely dissolved at room temperature to form a mixed solution of succinic anhydride.
[0027] 2. Add 4ml of 2mol / l hydrochloric acid solution and stir well.
[0028] 3. Immerse 30g of chitosan fiber non-woven fabric in the above solution, keep the water bath at 30°C, take out the non-woven fabric after 1.5hr, soak with absolute ethanol for 30min, dehydrate and dry in the air.
[0029] 4. Cut the dried chitosan fiber non-woven fabric into sheets with different sizes and shapes, and then pack them.
[0030] Accurately weigh G 1 = 0.1275g prepared chitosan fiber non-woven fabric is put into 50ml distilled water, taken out after 20min, suspended in the air, and weighed after no dripping, non-woven fabric wet weight G 2 =3.9942g, water absorption ratio Q=(G 2 -G 1 ) / G 1 = 30.3.
Embodiment 2
[0032] 1. Dissolve 50g of succinic anhydride in 5000ml of 90% ethanol solution, and stir until the succinic anhydride is completely dissolved at room temperature to form a mixed solution of succinic anhydride.
[0033] 2. Add 120ml of 2mol / l hydrochloric acid solution and stir well.
[0034] 3. Immerse 100g chitosan fiber non-woven fabric in the above solution, keep the water bath at 60°C, take out the non-woven fabric after 20 minutes, soak it with absolute ethanol for 20 minutes, dehydrate and dry it;
[0035] 4. Cut the dried chitosan fiber non-woven fabric into sheets with different sizes and shapes, and then pack them.
[0036] Accurately weigh G 1 = 0.1129g prepared chitosan fiber non-woven fabric is put into 50ml distilled water, taken out after 20min, suspended in the air, and weighed after no dripping, non-woven fabric wet weight G 2 =3.1020g, water absorption ratio Q=(G 2 -G 1 ) / G 1 = 26.5.
[0037] Add 0.6ml of monomeric nano-silver solution with a concentrati...
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