Preparation method of gelatin/poli vinyl alcohol (PVA) composite films improved by inorganic imvite
A technology of inorganic montmorillonite and composite membrane, which is applied in the field of preparation of gelatin/PVA composite membrane, can solve the problems of limited mechanical properties, limited application surface of composite membrane, etc., and achieves increased mechanical properties, good degradability, and good compatibility. Effect
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[0012] A preparation method of gelatin / PVA composite film modified by inorganic montmorillonite, the process includes the following steps:
[0013] (1) Preparation of polyvinyl alcohol solution: Weigh 4-11 parts by weight of polyvinyl alcohol into a three-necked flask, then measure 80-105 parts by weight of distilled water into the three-necked flask, and place the flask at 80-90°C Stir in a constant temperature water bath until the polyvinyl alcohol is completely dissolved to obtain an aqueous solution of polyvinyl alcohol, namely A solution;
[0014] (2) Preparation of gelatin solution: Weigh 5-10 parts by weight of gelatin into a beaker, then measure 80-100 parts by weight of distilled water into the beaker, swell for 30 minutes at room temperature, and stir in a constant temperature water bath at 50°C When the gelatin is completely dissolved, filter to remove impurities to obtain a gelatin solution, namely B solution;
[0015] (3) Preparation of gelatin / PVA composite film: Weigh...
Example Embodiment
[0021] Example 1
[0022] Weigh 10g of polyvinyl alcohol into a three-necked flask, add 90g of distilled water, mechanically stir it in a constant temperature water bath at 90°C until it is completely dissolved, and filter to remove impurities to obtain an aqueous solution of polyvinyl alcohol with a solution concentration of 10%;
[0023] Weigh 10g of gelatin into a beaker, add 90g of distilled water, swell at room temperature for 30 minutes, then stir in a constant temperature water bath at 50°C until it is completely dissolved, and then filter to remove impurities to obtain a gelatin solution with a solution concentration of 10%;
[0024] Add the above polyvinyl alcohol solution and gelatin solution to a 250ml three-necked flask at a weight ratio of 4:1, then add 0.6% of the total weight of the two solutions, plasticizer ethylene glycol, and store at 0°C for 5 hours. Add 0.05% sodium-based montmorillonite of the total weight of the two solutions, and then mechanically stir the rea...
Example Embodiment
[0026] Example 2
[0027] Weigh 10g of polyvinyl alcohol into a three-necked flask, add 90g of distilled water, mechanically stir it in a constant temperature water bath at 90°C until it is completely dissolved, and filter to remove impurities to obtain an aqueous solution of polyvinyl alcohol with a solution concentration of 10%;
[0028] Weigh 10g of gelatin in a beaker, add 90g of distilled water, swell at room temperature for 30 minutes, then stir in a 50°C constant temperature water bath until it is completely dissolved, and then filter to remove impurities to obtain a gelatin solution with a solution concentration of 10%;
[0029] Add the above polyvinyl alcohol solution and gelatin solution to a 250ml three-necked flask at a weight ratio of 4:1, then add 0.6% of the total weight of the two solutions, plasticizer glycerin, and store them at 5°C for 2 hours, then add two Sodium-based montmorillonite with 0.08% of the total weight of the solution, then mechanically stirred for 4 ...
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